P5 - Electric circuits

What is the definition of electric charge?

How does rubbing a plastic rod with a cloth make it charged?

What is the definition of an electric field?

What is electric current, in four words?

Charges don't move very quickly - so how come a bulb switches on immediately when a circuit is connected?

How does a battery work?

In which direction does conventional current go and in which direction do electrons flow? Why does this matter?

What happens to a bulb when a current increases?

What is used to measure current?

In a series current, what would roughly happen to a current of 10A after it's past through a bulb?

What two advantages are there of circuits in parallel?

What happens to a bulb when a current increases and why?

How does a bulb use resistance to work?

When resistance increases, what happens to current?

What rule means 'the current through a resistor is proportional to the voltage'?

Name two variable resistors and explain how they work.

What happens to the total resistance when a resistor is added to a simple circuit in parallel or in series?

What is the definition of voltage?

What is potential difference?

What is the potential difference for resistors in a parallel and in a series circuit?

In a series circuit, which would have the bigger potential difference, a small or a large resistor?

How does potential difference have a use in circuits? Describe.

What is 'power' in electric circuits and how is it worked out, with units?

What is one watt equal to in energy terms?

There's a link between electricity and magnetism. Describe this link, without an explanation.

A square wire is placed between a north and a south magnet. When a current is passed through it, what happens and why?

What makes the wire turn more than 90 degrees?

What is the name of the process in which a potential difference is generated in a wire when it's in a changing electromagnetic field?

What does it mean that potential difference is generated in a wire during electromagnetic induction and how?

In what four ways can the induced voltage produced be increased?

Describe alternating current and direct current.

What is a transformer, how does it work and what's it used for?

Why is the voltage stepped up and later stepped down in the National Grid?