Question

7. Determine the resistance of a lamp that draws 3 amperes when connected to a120-volt supply

Answer 1

A lamp draws 3 amperes of current and is connected to a 120 volt supply.

We are asked to find the resistance of the lamp.

Recall the Ohm's law is given by

`V=IR`

Where V is the voltage, I is current, and R is the resistance.

Re-arrange the equation for resistance

`R=(V)/(I)`

Substitute the given values

`\begin{gathered} R=(120)/(3) \\ R=40\; \Omega \end{gathered}`

Therefore, the resistance of the lamp is 40 ohms.