What we will do today:

1. What we will do today: • State the function of a supply voltage (from any power source). • Carry out experiments to correctly connect both voltmeters and ammeters.

2. What does voltage mean? • The voltage is a measure of the energy available to move charges around a circuit. • It has the unit volt (V). • Further explanation: A supply voltage of 1 volt means that 1 joule of energy is supplied to each coulomb of charge.

3. Supply Voltage & Current • If the supply voltage in a circuit increases then the current also increases. • E.g. If the supply voltage to a bulb increases the bulb will get brighter. • This is because the flow of charges is increased.

4. Position of Ammeter(don’t copy) • If we have a circuit with a battery and bulb, how can we determine which way the Ammeter should be placed? • How should we set up our circuit?

5. Measuring current • When measuring current, the ammeter must be set up in series. • E.g. beside the component.

6. Position of Voltmeter (don’t copy) • If we have a circuit with a battery and bulb, how can we determine which way the voltmeter should be placed? • How should we set up our circuit?

7. Measuring voltage • When measuring voltage, the voltmeter must be set up “parallel”. • E.g. above or below the component.

8. 2006 Qu: 8

9. What have we learned today? • Voltage of a supply is a measure of the energy given to the charges in the circuit. • If the supply voltage is increased so is the current. • A voltmeter must be set up in parallel in a circuit. • An ammeter must be set up in series in a circuit.