#### Sparkletron

##### Member

- Joined
- Sep 10, 2010

- Messages
- 14

Can someone help me understand why the answer I selected is not correct...?

First I determined the current using Ohm's law:

E = IR

I = E / R

I = 400VDC / 800R = 0.5A

Then the power:

P = IE

P = 0.5A x 400VDC = 200W

First I determined the current using Ohm's law:

E = IR

I = E / R

I = 400VDC / 800R = 0.5A

Then the power:

P = IE

P = 0.5A x 400VDC = 200W

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