Power and Energy:Power in a Parallel Circuit

Power in a Parallel Circuit

The power dissipated by any resistor is given by, the voltage across that resistor multiplied by the current flowing through it.

Power in a Series / Parallel Circuit

Example

1. Find the total power dissipated in the circuit.

2. Find the power dissipated by:

Domestic Example

An electric shower element is drawing a current of 36 Amps. The voltage at its terminals is 228 Volts. What is the power dissipated by the shower element?

Question

The following loads are connected to a 230 V supply.

1. 9 kW electric shower

2. 3 kW immersion heater

3. 750 W food mixer

4. 1.5 kW electric fire

5. 10 X 75 W lamps Find:

1. The current taken by each appliance.

2. The total current.

3. The total power.

4. The resistance of each appliance.

5. The approximate total resistance.