I = 5,000 watts ÷ by 240 volts; I = 20.8 amps; Because the electric space heater on a continuous load could operate for three or more hours on a cold day, a safety factor of 125 percent is applied.

In this week’s Gizmodo University: Discover Electronics, we’re diving headfirst into the principle theories of electronics. The second of four classes in this series, “Volts, Amps, and Ohms ...