David Sang Solutions for Chapter: Electrical Quantities, Exercise 9: Questions

Write down the equation connecting $\mathrm{watt}, \mathrm{volt}, \mathrm{ampere}$.

A $10\hspace{0.17em}\mathrm{V}$ power supply pushes a current of $5.0 \mathrm{A}$ through a resistor. At what rate the energy is transferred to the resistor?

A tropical fish tank is fitted with an electric heater, which has a power rating of $30 \mathrm{W}$. The heater is connected to a $12 \mathrm{V}$ supply. What current flows through the heater when it is switched on?

How much energy is transformed by an electric lamp in $100 \mathrm{s}$ if a current of $0.22 \mathrm{A}$ flows through it when it is connected to a $120 \mathrm{V}$ supply?