Question

a lamp or bulb is marked 12 volt 240 Watts how many joules does it consume in one hour and what is the current that passes through it ​

Answer 1

1 watt is 1 Joule per second. 240 watt would then be 240 joules per second. How many seconds are there in an hour? Current formula is P= IV , P is 240(not the power in an hour because the current is calculated in seconds), and V is 12V. Then you will get I, the current.