# P=i^times 32

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• #12108
Phillip Cross

how do you figure what the total circuit current is when you have L1 and L2 then between there are 2 heat elements?

#12109
Susan Brown
Keymaster

Hi Phillip,

Great question. I’m going to step you through it with a few questions. We’ll go back and forth a bit until it’s clear to you!

1. The fact that you have L1 and L2 as the power supply tells you what the source voltage is. Do you know what it is?

2. You are describing two loads (elements) in series. Will the current change at different points in the circuit, or is it always the same?

Answer those and we’ll keep going!

#12110
Phillip Cross

240 volts. yes the current changes because each load has a different resistance.

#12111
Susan Brown
Keymaster

240 volts

Correct!

yes the current changes because each load has a different resistance.

Ah! We’ve identified one of the things you need to clear up. This isn’t correct. Rewatch the first video in Mod. 3, unit 5 to see what we say about current in a series circuit – let me know what you find.

#12112
Phillip Cross

the current is exactly the same at every point. always

#12113
Susan Brown
Keymaster

Yes!

So, you know the voltage. Do you know the resistance of the loads?

What Ohm’s Law equation do you think you would use?

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