Finding electrical energy used by a light

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Homework Help Overview

The discussion revolves around calculating the electrical energy used by a light based on given voltage and current values. The subject area includes concepts from electrical circuits and energy calculations.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants explore various formulas related to voltage, current, and energy. Questions arise regarding the correct formula to use and how to relate the given values to find energy.

Discussion Status

Several participants have offered guidance on identifying relevant formulas, with some suggesting the use of power calculations and the relationship between power and energy. There is an ongoing exploration of how to incorporate time into the calculations.

Contextual Notes

Participants note the importance of using the correct SI units, particularly for time, and there is mention of the need to convert minutes into seconds for accurate calculations.

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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?
 
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The SI unit of energy is the Joule. The Ohm is the unit of resistance.
 
Which is the correct formula that I should be using?
 
Think of a formula that links all the givens, that is, voltage, current, time and energy.
 
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.
 
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?
 
Note the SI unit for time..
 
multiply by 120 seconds
 
Job done :thumbs:
 
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