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# Y9 Electricity **A Circuit Symbols** | Number | Symbol | Description | |---|---|---| | 1 | ◯─ | switch (open) | | 2 | ◯──◯ | switch (closed) | | 3 | +──− | cell | | 4 | ──||──| battery | | 5 | ──⊕── | diode | | 6 | ──▭── | resistor | | 7 | ──↔── | variable resistor | | 8 | ──►── | LED | | 9 |...

# Y9 Electricity **A Circuit Symbols** | Number | Symbol | Description | |---|---|---| | 1 | ◯─ | switch (open) | | 2 | ◯──◯ | switch (closed) | | 3 | +──− | cell | | 4 | ──||──| battery | | 5 | ──⊕── | diode | | 6 | ──▭── | resistor | | 7 | ──↔── | variable resistor | | 8 | ──►── | LED | | 9 | 💡 | lamp | | 10 | 🠆 | fuse | | 11 | Ⓥ | voltmeter | | 12 | Ⓐ | ammeter | | 13 | ──⭳── | thermistor | | 14 | ☀️| LDR | **B Electricity Terminology** | Number | Term | Description | |---|---|---| | 15 | Current | The rate of flow of charge. Electrons flowing around the circuit. Measured in amps (A). | | 16 | Potential Difference | A measure of how much energy is transferred to each electron. Measured in volts (V). | | 17 | Resistance | A measure of the opposition to current flow in an electrical circuit. Measured in ohms (Ω). | **C Electrical Circuits** | Number | Term | Description | |---|---|---| | 18 | Series Circuit | Series circuits follow one single loop. | | 19 | Parallel Circuit | Parallel circuits contain more than one loop. | | 20 | Ammeter | Used to measure current (in amps). | | 21 | Voltmeter | Used to measure potential difference (in volts). | **D Key Equations** * Potential Difference (V) = Current (I) × Resistance (R) (V = I × R) * Charge (Q) = Current (I) × time (t) (Q = I × t) * Energy Transferred (E) = Potential Difference (V) × Charge (Q) (E = V × Q) **E Required Practical: Resistance of a wire** Diagram showing a wire with a voltmeter and an ammeter connected to measure the resistance of the wire. The diagram shows instructions to measure resistance of a wire by following a QR code. **Note**: The image includes several QR codes. These have not been included in the markdown output, as they are not text. They likely contain more details about the practical activities or other related information.