Domestic Electricity Questions
1) What are the Voltages and frequencies for
each of these traces?The Oscilloscope has 1V/div on the y axis
and 2s/dive of the x axis
2)Draw the following traces. An Oscilloscope that has 50V/div and 0.02s/div: a)A DC current of 25V b)A DC current of 200V c)An AC current of 240V and 50Hz d)An AC current of 50V and 25 Hz |
3) Why would it be dangerous to wire a plug without:
a) a fuse?
b) an earth wire?
4) A toaster runs at 10A which fuse should it use and why: 3A, 5A, 13A
5) A hairdryer has a power of 2400W and a voltage of 240V, how much current flows through it?
6) A mobile charger has a current of 3A and voltage of 10V.
a) How much power does it use?
b) It takes 4 hours to charge your phone, how much energy in J is transfered?
c) How much energy in kWh?
d) The cost of your electricity is 9p/kWh. How much does charging the phone cost?
7) Why does the national grid operate at a high voltage and low current?
a) a fuse?
b) an earth wire?
4) A toaster runs at 10A which fuse should it use and why: 3A, 5A, 13A
5) A hairdryer has a power of 2400W and a voltage of 240V, how much current flows through it?
6) A mobile charger has a current of 3A and voltage of 10V.
a) How much power does it use?
b) It takes 4 hours to charge your phone, how much energy in J is transfered?
c) How much energy in kWh?
d) The cost of your electricity is 9p/kWh. How much does charging the phone cost?
7) Why does the national grid operate at a high voltage and low current?