A

V

componenthere R

Voltage is measured by connecting the voltmeter across (or in parallel with) the component.

Voltage is measured in volts and the symbol for this is V.

V

Components

Measuring voltage - across a resistance or a bulb

1. Set up the circuit as shown above.2. Connect the voltmeter across the power supply and

measure the supply voltage. 3. Then connect the voltmeter across the resistance (R)

and measure this voltage.

Experiment: measuring voltage

R

V

V

Circuit 1

1. Add another resistance (R2) to the circuit as shown.2. Connect the voltmeter across the power supply and

measure the supply voltage. 3. Then measure the voltage across each of the resistances.

R1 R2

V

V1 V2

Circuit 2

Experiment: measuring voltage

Record your results:

Circuit 1: Voltage (supply) = V

Voltage (R1) = V

Circuit 2: Voltage (supply) = V

Voltage (R1) = V

Voltage (R2) = V

R1 R2

V

V1 V2

R1

V

V

Circuit 1 Circuit2

The current is the ____ of electricity around the circuit. The _______ is the amount of push.

When two components were put into Circuit 2, the voltage of the supply was the ____ as Circuit 1. However, the voltage across R1 ________ .

The voltage across both components in circuit 2 added to be equal to the _____ voltage.

supply, decreased, voltage, flow, same

Circuit2

R1 R2

V

V1 V2

R1

V

V

Circuit 1 Circuit2

V1

V2

V3

Measuring voltage in parallel circuits

Connect together the circuit shown above and measure, in turn, the voltage at V1, V2 and V3.

Write down your results in the table below :

Voltmeter Voltage

(V)

V1

V2

V3

Explain anything you notice about the results.

Parallel and series circuits