Why is iron preferred to steel for use as the core of an electromagnet?
If the current is switched on as shown in the diagram which way does the wire move?
The diagram shows the end of a coil in a magnetic field. What happens to the coil?
What happens when a bicycle dynamo is connected across a moving coil voltmeter and turned slowly?
The diagram shows a form of current measuring instrument. What happens to the compass needle if the current in the coil is increased?
What do the brushes do in a generator?
How would you increase the voltage output of a generator?
What is the commutator for in an electric motor?
Why is an alternator used in petrol engine cars?
Why is electricity transmitted across the country at high voltage / low current?