When a ball is dropped from a height onto a loop the loop the energy transfer is Kinetic to GPE
Mrs Smith Would like to fit draught proofing into her house for a fee of £150. This will save 6000w of power for heating every two hours. Each unit cost 5p, What is the Payback time of the draught proofing?
A current of 2 A flows for 30 seconds through a lamp. How much charge has moved?
A current of 12 A flows for 20 minutes into an electric cooker. How much charge has the cooker used?
Watts are a measurement of energy
Joules are a measurement of energy
What is current measured in?
How is current measured?
What is the equation to work out power
P= V x I
Which Circuit do you connect an ammeter to measure the current?
A Petrol car requires 5,000J of energy to run properly. 3,467J of that are wasted as Heat(Thermal) energy. How much usefule energy is there, What type of energy, and what is the efficiency of the car?
1,533J ,Thermal, 32.98%
1235J, Electrical, 30.66%
1533J, Kinetic, 30.66%
1435J, Kinetic, 54.983%
What is 1KW equivalent to?