Finding electrical energy used by a light

[owtu]

Homework Statement

find electrical energy used by the light if the voltage on the battery is 110 V and the current in 2.0 minutes is 10 mA

V = 110
I = 10 mA

Homework Equations

R = V/I

The Attempt at a Solution

110 V /.010 A

= 11,000 ohms

= 11 k ohms


I'm new to this, did I do this problem right?

 

[CWatters]

The SI unit of energy is the Joule. The Ohm is the unit of resistance.

 

[owtu]

Which is the correct formula that I should be using?

 

[PhysicoRaj]

Think of a formula that links all the givens, that is, voltage, current, time and energy.

 

[CWatters]

Might be easier to find two formula?

One that gives you the power from some of the givens.
One that gives you energy from power and another given.

 

[owtu]

I think I found it

P = I * V

then I multiply power, in watts, by 2 minutes and I got an answer in Joules, is that it?

 

[PhysicoRaj]

Note the SI unit for time..

 

[owtu]

multiply by 120 seconds

 

[PhysicoRaj]

Job done :thumbs: