Question

A calculator is rated at 0.21W when connected to a 1.5 V battery. what is the resistance of this device?

Answer 1

\[P=\frac{V^2}{R}\]\[0.21W=\frac{1.5^2}{R}\]\[R=10.7A\]

Answer 2

R= 10.7 ohm not A

Answer 3

typo, thanks