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HIA International — Grade 8

Unit 1: Photosynthesis and the carbon cycle

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Unit 2: Properties of materials

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Unit 3: Forces and energy

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Unit 4: Maintaining life

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Unit 5: Reactivity

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Unit 6: Sound and space

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Unit 7: Genes and inheritance

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Unit 8: Rates of reaction

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Unit 9: Electricity

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Quiz

Checkpoint Grade 8 Unit 9 – 9.3 Measuring The Flow Of Current

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Measuring The Flow Of Current Checkpoint Physics quiz set 2: free practice for Cambridge Checkpoint Physics 0893. Work through this Measuring The Flow Of Current Checkpoint Physics quiz set 2 and get instant feedback on every answer. If you get stuck, review the 5.3 Measuring the flow of current lesson. More practice: Cambridge Checkpoint Physics 0893 — all units. Syllabus: Cambridge Lower Secondary programme.

  • Questions count: 50
  • Passing grade: B+
  • Time limit:
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1.
Which statement correctly describes current?
a meter used to measure current
the unit of current
the rate of flow of electric charge
connected in one continuous loop
2.
Which statement correctly describes ammeter?
the rate of flow of electric charge
the unit of current
a meter used to measure current
connected in one continuous loop
3.
Which statement correctly describes in series?
the rate of flow of electric charge
a meter used to measure current
the unit of current
connected in one continuous loop
4.
Which statement correctly describes ampere?
the rate of flow of electric charge
connected in one continuous loop
the unit of current
a meter used to measure current
5.
Which of these is the FIRST step in the correct order?
insert the ammeter in series
complete the circuit
read the value in amperes
break the circuit at the measurement point
6.
Which step comes immediately after "insert the ammeter in series"?
break the circuit at the measurement point
read the value in amperes
complete the circuit
7.
Which practical work belongs to Measuring The Flow Of Current?
Translate between a real circuit and a labelled circuit diagram
Test materials in a simple circuit and classify them from evidence
Use a complete circuit model and distinguish electron flow from conventional current direction
Measure current at different points in a series circuit and compare readings
8.
Sakura's ammeter has two scales. She connected her circuit to the − terminal and the "+ 5 A" terminal, as shown. What current is flowing?
Dr Dabour Hub Academy - figure 1
0.64 amperes
0.32 amperes
3.2 amperes
6.4 amperes
9.
In Kwame's circuit, ammeter A1 reads 0.60 A. Lamps L2 and L3 are identical. What do ammeters A2 and A4 read?
Dr Dabour Hub Academy - figure 2
A2 reads 0.60 A; A4 reads 0.30 A
A2 reads 0.30 A; A4 reads 0.30 A
A2 reads 0.60 A; A4 reads 0.60 A
A2 reads 0.40 A; A4 reads 0.20 A
10.
Ali left a torch switched on and recorded the current every hour. The lamp is too dim to be useful once the current is below 0.20 A. For roughly how long was the torch useful?
Dr Dabour Hub Academy - figure 3
About 8 hours
About 5.5 hours
About 3 hours
About 7 hours
11.
Hiba measured the current through a small motor with the multimeter shown. The dial points to the 200 mA range. What is the current in amps?
Dr Dabour Hub Academy - figure 4
45 amperes
0.45 amperes
450 amperes
0.045 amperes
12.
By mistake, Yara connected her ammeter across lamp Q instead of in series, as shown. An ammeter has a very low resistance. What will she most likely observe?
Dr Dabour Hub Academy - figure 5
Both lamps stay the same; the reading is correct
Both lamps go out, as the ammeter blocks the current
Lamp Q goes out; lamp P gets brighter
Lamp P goes out; lamp Q gets brighter
13.
Eight groups built the same circuit with the same type of lamp and cell and measured the current. Their results are plotted. What is the best value for the class to use?
Dr Dabour Hub Academy - figure 6
About 0.25 A, the mean of seven results
0.41 A, the largest reading
About 0.27 A, the mean of all eight
About 0.33 A, halfway from 0.24 to 0.41
14.
Omar measured the current through a lamp at different voltages. Use two points on his graph to decide what happens to the lamp's resistance as the voltage rises from 2 V to 6 V.
Dr Dabour Hub Academy - figure 7
It falls from 10 Ω to 5 Ω
It rises from 10 Ω to 20 Ω
It stays at 10 Ω the whole time
It rises from 0.1 Ω to 0.05 Ω
15.
Farida measured one current on three ranges of her digital meter. Which result should she record?
0.3 A from the 10 A range
0.32 A from the 2 A range
317 mA from the 200 mA range
0.317 A from the 10 A range
16.
Using Ibrahim's results, what is the best value of the current with 3 cells?
0.345 A, ignoring the 0.52 A result
0.40 A, the mean of all three trials
0.52 A, the highest of the trials
0.35 A, as trial 3 was the final one
17.
Use the readings in the table to calculate the resistance of the lamp.
0.02 ohms (0.02 Ω)
50 ohms (50 Ω)
450 ohms (450 Ω)
20 ohms (20 Ω)
18.
Joon changed the total resistance of his circuit and recorded the current. What current should he get at 40 Ω?
0.20 amperes
0.15 amperes
0.40 amperes
0.05 amperes
19.
Carla expects the current in her circuit to change from about 0.30 A to 0.34 A when she warms a component. Which meter should she use, and why?
Meter N, as it can show a change of 0.01 A
Meter M, as a bigger full-scale reading is better
Meter M, as analogue meters have no errors
Either meter, as both can measure 0.30 A
20.
Noura wants to show that the current splits at a junction in a parallel circuit, using just one ammeter. Which plan is best?
Measure only in the main wire, with the switch open and then closed
Measure in one branch twice and double that value to find the total
Measure in each branch and the main wire in turn, switching off to move it
Measure next to the cell with one lamp and then with a longer wire
21.
An ammeter in a series circuit with a 6.0 V battery reads 0.30 A. After Dev adds a resistor to the loop, it reads 0.20 A. What is the total resistance of the circuit now?
20 ohms (20 Ω)
10 ohms (10 Ω)
1.2 ohms (1.2 Ω)
30 ohms (30 Ω)
22.
A series circuit has two lamps. Lamp 1 is replaced by a lamp with a higher resistance, using the same cells. What happens to the ammeter readings?
They fall everywhere in the loop, by the same amount
They fall only next to the new lamp
They rise everywhere, as the new lamp takes more
They stay the same, as the cells are unchanged
23.
Why is the current in a parallel branch never bigger than the current in the main wire next to the cell?
The branches use up some of the current from the cell
The main current is the sum of all the branch currents
Each branch has less voltage than the main wire does
The ammeter in the main wire always reads a bit high
24.
Two identical buzzers are in parallel. The current from the cell is 360 mA. What does an ammeter in one buzzer's branch read?
0.36 amperes
180 amperes
0.18 amperes
0.72 amperes
25.
In the equation R = V ÷ I, what does the letter I stand for, and in what unit is it measured?
Current, in amperes
Resistance, in ohms
Voltage, in volts
Charge, in electrons
26.
Match each quantity to its symbol and unit. Which pairing is correct?
V – current, measured in volts (V)
R – voltage, measured in ohms (Ω)
I – current, measured in amperes (A)
A – resistance, measured in amperes (A)
27.
Match each situation to the reading on an ammeter placed next to the cell. Which pairing is correct?
Third identical lamp added in parallel – reading falls
Series loop with the switch open – 0 A
Extra cell added in series the same way – reading falls
Ammeter moved to the other side of the cell – reading doubles
28.
Match each key term about measuring current to its meaning. Which pairing is correct?
Branch – the wire joining the cell to the ammeter
In series – connected across a component
Milliamp – one hundredth of an ampere
Reading – the value shown on a meter, with its unit
29.
Match each circuit to the pattern of its ammeter readings. Which pairing is correct?
Parallel, identical branches – equal branch readings that add up to the main reading
Series, three lamps – the reading falls a little after each lamp in turn
Parallel, one branch switched off – the main reading does not change
Series, one lamp broken – the reading drops only next to that lamp
30.
Three identical lamps are in parallel. The ammeter next to the cell reads 0.96 A. Aziz unscrews one lamp. What does the ammeter read now?
0.96 amperes
0.32 amperes
1.44 amperes
0.64 amperes
31.
Which term is described as: the rate of flow of electric charge?
ammeter
ampere
current
in series
32.
Which term is described as: a meter used to measure current?
current
ampere
ammeter
in series
33.
Which term is described as: connected in one continuous loop?
current
ampere
in series
ammeter
34.
Which term is described as: the unit of current?
current
ammeter
in series
ampere
35.
Using the table, ammeter Z should read _____.
370 amperes
0.13 amperes
0.37 amperes
3.7 amperes
36.
The pointer of Musa's ammeter goes past the end of the scale. He should switch off and change to a _____.
more sensitive range
higher (larger) range
voltmeter instead
longer wire lead
37.
A lamp has 2.4 V across it and a current of 80 mA through it. Its resistance is _____.
30 ohms (30 Ω)
0.03 ohms (0.03 Ω)
192 ohms (192 Ω)
300 ohms (300 Ω)
38.
In a parallel circuit, an ammeter placed in one _____ measures only the current through that path.
main wire by the cell
cell terminal
series voltmeter
separate branch
39.
Tomasz put three ammeters in one series loop. He concludes that meter 2 is faulty or has a zero error. True or false?
False – more current flows at meter 2
False – each meter takes some current
True, but only if meter 2 is last
True – all three should read the same
40.
A digital ammeter set to its 10 A range reads 0.00 A in a working circuit with a tiny LED. The current might really be a few milliamps. True or false?
True – the range is too big to show it
False – 0.00 A means no current flows
False – the LED must be broken
True, but only if the meter is analogue
41.
An ammeter placed between two identical lamps in a series circuit reads half the current that leaves the cell. True or false?
True – the first lamp takes half
False – it reads the full current
True, as the lamps are identical
False – it reads double the current
42.
In a parallel circuit with two identical lamps, the ammeter in each branch reads half the current in the main wire. True or false?
True – the current splits equally
False – each branch has the full current
False – the first branch takes more
True, but only with a single cell
43.
A lamp with 4.5 V across it has a current of 300 mA, so its resistance is 15 Ω. True or false?
False – it is 0.015 Ω
False – it is 1350 Ω
True – 4.5 ÷ 0.300 = 15 Ω
True, but only if it is dim
44.
The ampere is the unit of current, and the symbol for current in equations is I. True or false?
False – current uses the symbol C
False – the ampere is for voltage
True, but it is written as ohms
True – current I is measured in A
45.
Salim reads 0.25 A on an ammeter next to the cell. Opening a switch in one branch of his parallel circuit will make this reading smaller. True or false?
False – the reading next to the cell cannot change
False – the other branches take more, so it stays
True – that branch no longer adds current
True, but all the other branches also switch off
46.
An ammeter measures the current only at the place in the circuit where it is connected. True or false?
True – in a branch it shows that branch only
False – it shows the total current anywhere
False – it shows the current in the cell
True, but only in a series circuit
47.
Two identical lamps in parallel each carry 0.20 A, so the cell supplies 0.40 A. If Ruth rewires the same lamps in series with the same cell, the ammeter next to the cell will still read 0.40 A. True or false?
True – the same lamps always take 0.40 A
False – in series the current is much smaller
True, because the cell has not been changed
False – in series it will be exactly 0.80 A
48.
Jana says: "If two ammeters in the same series loop read 0.41 A and 0.42 A, this proves current is used up." True or false?
True – the second meter shows less current
True, since the readings are not identical
False – so small a gap is likely meter error
False – the current must be growing instead
49.
Maryam's series loop has one cell and one lamp, and the ammeter reads 0.20 A. She adds a second, identical cell facing the other way. The ammeter will now read about 0.40 A. True or false?
True – two cells always double the current
True, as long as the lamp does not break
False – it will read about 0.10 A instead
False – the cells cancel, so it reads about 0 A
50.
In a series loop, replacing a lamp with a short, thick copper wire will make the ammeter reading bigger. True or false?
False – the ammeter reading stays the same
False – copper wire stops the current flowing
True, but only if the ammeter is by the wire
True – the resistance of the loop falls
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Part of Unit 9: Electricity — see every lesson and quiz in this unit.
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