Question

If P = 50 watt and R = 2 ohms, then I = _

Answer 1

Electric power is equal to product of electric current I and voltage V

$P=I\cdot V.$

We know that according to Ohm's law $V=I\cdot R,$ so $P=I^2\cdot R.$

If R=2 ohms and P = 50 watt, we get

$I = \sqrt{\dfrac{P}{I}} = \sqrt{\dfrac{50}{2}} = 5 \,\mathrm{A}.$