Define electric current

Electric current is a measure of the rate of flow of charges. What this means is how many charges are flowing in a circuit in a certain time period. Mathematically this is expressed as I=Q/t where I is for current measured in amps (A). Q is charge measured in Coulombs(C) and t is the time period measured in seconds.

LM

Related Physics GCSE answers

All answers ▸

A lorry is travelling around a roundabout at constant speed. Why is its velocity changing?


a )John heats up 2kg of water from 20 degrees c to 80 degrees c. How much energy input did this require? b )When John weighs the water at the end, he has less than he started with. Why might this be? c) What hazards are in this experiment?


What is the difference between current and voltage?


Compare the medical uses of ultrasound and X-rays. Your answer should include the risks, if any, and precautions, if any, associated with the use of ultrasound and X-rays. [6 marks]