How Do You Calculate Electrical Energy for Homework?

[LatexZone]

Homework Statement

Can you please give me some questions and I will see if I can work out the electrical energy?

Homework Equations

This is what I am going to be working from (Please tell me if it's not correct):

Energy = Power x Time OR E=Pt
Power = Current x Voltage OR P=IV
Substitute
Energy = Current x Time x Voltage OR E=ITV

The Attempt at a Solution

N/A

 

[mgb_phys]

Yes that's correct

ps. In electrical stuff you generally use 'Q' for energy, because E can also mean voltage or electric field in some equations

 

[LatexZone]

Thanks for verifying, but can you give me any scenarios (questions) where I can use the formula to work out the answer?

 

[mgb_phys]

Electric water heater?

You have 230V and 13Amps, how much energy/sec does it put into 1kg of water?
How long does it take to heat 1kg of water form 20C to 100C ?

 

[Borek]

Less than 2 minutes.