## AQA GCSE Electrical Power

**Electrical Power**

Electrical power is the rate of energy transfer.

There are different equations for working with electrical power

**Example question**

**A 5W light bulb is switched on for 2 minutes, calculate the energy transferred. **

Convert the 2 minutes into seconds. 2 minutes = 120 seconds

Energy = Power x time

Energy = 5W x 120 seconds

Energy = 600J

**Example calculation**

**1. A mains kettle uses 2300W and 230V. **

**(a)Calculate the current that kettle uses for normal use.**

P = V x I

I = P/V

I = 2300/230 = 10A

**Example calculation**

**1. A tumble dryer has a current of 11A flowing and a resistance of 20 ohms. Calculate the power of the tumble dryer.**

P = I^{2} x R

P = 11^{2} x 20

P = 2420W

**Practice Questio****ns**

1.An electric heater uses 12.9kJ of energy whilst switched onand has a power rating of 600W. Calculate how long the heater was switched on for.

2.A 3kW kettle draw a current of 12A from the mains supply. Calculate the potential difference of the mains supply

3.A dishwasher has a power rating of 1.2kW and a resistance of 40Ω. Calculate the current flowing through the dishwasher.

Absorption and Emission of EM Radiation

JJ Thomson and Plum pudding model

Ernest Rutherford and the Nuclear Model

Niels Bohr changing the Nuclear Model

Discovering the Proton and Neutron

Measuring radiation from radioactivity

Radiation types and properties

Random nature of radioactive decay

Radioactive contamination or irradiation

Hazards of contamination and irradiation

Studies on the effects of radiation on humans

Different half lives of radioactive isotopes

Nuclear Fission Chain Reaction

Writing nuclear fission equations