Question

Calculate the resistance of a 900.-watt toaster

operating at 120 volts. [Show all work, including
the equation and substitution with units.]

Answer 1

Using the Definition of Potency, we have:


`P= (V^2)/(R)`

Entering the unknowns:


`P= (V^2)/(R) \\ 900*W= ((120*V)^2)/(R) \\ R= (14400*V^2)/(900*V*A) \\ R=16* (V)/(A) \\ \boxed {R=16Ohm}`

If you notice any mistake in my english, please let me know, because i am not native.

Answer 2

Answer : Resistance is 16 ohms.

Explanation :

It is given that,

Power of toaster,
`P=900\ Watt`

Voltage,
`V=120\ V`

According to ohm's law, V = I R

Mathematically power is defined as :

`P=(V^2)/(R)`

or

`R=(V^2)/(P)`

`R=((120\ V)^2)/(900\ W)`

`R=16\ \Omega`

So, the resistance of the toaster is 16 ohms.

Hence, this is the required solution.