What happens to a resistor when a current flows through it? How can this be put to use?

Write down an equation to calculate electrical power using current and potential voltage. Remember that potential difference is just an alternative word for voltage.

State all units and rearrange in all ways for the equation in question 10. How can this equation be used to calculate fuse values?

Write down an equation that links energy transferred, current, voltage and time. Rearrange the equation in all ways and state the units and symbols for each one.

What is the difference between a.c. electricity and d.c. electricity? Which is supplied by a cell or battery and which is supplied by the mains electricity?

You will find the answers to these questions in the brilliant Primrose Kitten video