# Power Consumption #2

## Homework Statement

A toaster with 18Ω is conducted to a 220 volt source. What is the power consumed by the toaster.

P=IV

## The Attempt at a Solution

P=18(220)
P= 3,960

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PeterO
Homework Helper

## Homework Statement

A toaster with 18Ω is conducted to a 220 volt source. What is the power consumed by the toaster.

P=IV

## The Attempt at a Solution

P=18(220)
P= 3,960
You have multiplied the resistance by the voltage, the formula you stated was for current by voltage.
You need to incorporate Ohms law.

Although it seems annoying, it helps to keep re-writing your units to check if your answer has the correct dimensions.

P = IV is a good equation to use, but here you aren't given the current; you're given the resistance of the toaster. Try using Ohm's law to rearrange the equation for power and find an equation whose knowns are already given.

What do you mean?

Ohm's law relates the resistance, current and voltage of a circuit. Knowing this, you can solve for any one (resistance, current, voltage) and put it in terms of the other two.