1.2Unit 9: Electricity and circuits
Electrical circuits — Cambridge Checkpoint Physics 0893 Revision Notes & Topical Questions
5 min read 9 parts Lesson 2 of 5 1 quiz
Lesson summary
1.2 Electrical circuits — CHECKPOINT PHYSICS 0893 notes: Recognise and draw circuit symbols and circuit diagrams for cells, switches, lamps, buzzers and ammeters.Circuit diagram = a drawing of a circuit using standard symbolsEasier — circuit diagrams are easier to draw than pictu…
- Straight wires
- Same symbol
- Short line
- No wires through components
- Straight lines
- Several correct versions
Part 1 of 7Circuit diagrams
Circuit diagram
Circuit diagram a drawing of a circuit using standard symbols
Easier
- Easier circuit diagrams are easier to draw than pictures
Standard symbols
- Standard symbols the same symbols are used in all countries so there is no confusion
Straight wires
- Straight wires wires are drawn as straight lines that are easy to interpret
Same symbol
- Same symbol components that look different, such as different lamps, have the same symbol
Part 2 of 7Circuit symbols and functions
| Component | Function |
|---|---|
| Cell | Provides energy to make current flow |
| Lamp | Gives out light |
| Switch (open) | Stops the flow of current |
| Switch (closed) | Allows current to flow |
| Buzzer | Makes a buzzing sound |
| Ammeter | Measures current in the circuit |
Part 3 of 7Symbol for a cell
Long line
- Long line positive terminal
Short line
- Short line negative terminal
Part 4 of 7Drawing a correct diagram
Drawing a correct diagram
No gaps
- No gaps leave no gaps in the lines, especially at corners and where wires meet components
No wires through components
- No wires through components wires must not be drawn through a component
Straight lines
- Straight lines use straight lines and right-angle corners for wires
Several correct versions
- Several correct versions different diagrams for the same circuit can both be correct
Part 5 of 7Jobs of different circuits
Doorbell
- Doorbell a cell, a switch and a buzzer, where pushing the switch makes the buzzer sound
Room light with ammeter
- Room light with ammeter a cell, a switch, a lamp and an ammeter
Current check
- Current check a smaller current means the cell is low on stored energy
Dimmer lamp
- Dimmer lamp the lamp also becomes less bright as the cell runs low
Part 6 of 7Where the ammeter goes
Position
- Position the ammeter is connected in the circuit so the current flows through it
Purpose
- Purpose it measures the current in the lamp, buzzer or other component in series with it
Part 7 of 7More from the specification
More from the specification
Standard circuit symbols
- Universal graphical representations used to draw neat, standardized circuit diagrams.
- (e.g. cell, battery, switch, lamp, buzzer, ammeter)
Series circuit characteristics
- An electrical configuration where components are connected one after another in a single loop, sharing identical current.
Open vs closed switch function
- A closed switch provides continuity allowing current to circulate;
- opening the switch creates an air gap that instantly halts current.
Troubleshooting electrical circuits
- Systematically identifying mistakes that prevent circuit operation.
- (such as reversed cell polarity, blown bulbs, or loose wiring connections)
Key terms
| Term | Meaning |
|---|---|
| Circuit diagram | Drawing of a circuit using standard symbols. |
| Circuit symbol | Standard picture for a component. |
| Ammeter | Component that measures current. |
| Switch | Component that opens or closes a circuit. |
| Buzzer | Component that makes a buzzing sound. |
| Lamp | Component that gives out light. |
Avoid these mistakes
1
Drawing gaps at the corners — the lines must join so the circuit is complete.
2
Drawing wires through components — wires should join the ends of a component only.
3
Mixing up the long and short lines of a cell — the long line is positive.
4
Using different symbols for different lamps — all lamps have the same symbol.
Marked practiceQuizzes for this lesson
Last updated:
\n