5.2Unit 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

📚 Cambridge Checkpoint Physics 0893 Hub / Topical Revision

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Lesson summary

5.2 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

1Standardized schematic diagrams

Circuit drawings utilizing internationally recognized symbols to clearly convey component connections.

2Series circuit properties

Components connected in a single loop share identical current, but total supply voltage is divided across the individual loads.

3Switch mechanism

Mechanical contact that makes or breaks circuit conductivity to control electric current without altering circuit configuration.

4Detecting circuit faults

Checking for short circuits, loose terminals, or burnt filament lamps using an ammeter or continuity tester.

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

Drawing gaps at the corners — the lines must join so the circuit is complete.

Drawing wires through components — wires should join the ends of a component only.

Mixing up the long and short lines of a cell — the long line is positive.

Using different symbols for different lamps — all lamps have the same symbol.

Last updated: 14 October 2026