Electric power, energy transfer and mains safety

By the end you’ll be able to

• calculate electrical power, current or potential difference using $P = IV$ and, where appropriate, $P = I^2R$ and $P = \frac{V^2}{R}$
• calculate electrical energy transferred using $E = Pt$ and relate this to the transfer of energy by current in components
• use and convert units for power and energy, including watts, kilowatts, joules and kilowatt-hours