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This may vary by make and model of toaster and the intended operating voltage.

For a North American toaster designed to operate on a 15 ampere outlet at 120 volts RMS, the hot resistance cannot be any less than 8 ohms. By their nature, heating elements have a lower resistance when cold, so an 8 ohm element needs to be used on a circuit that is protected by a thermal time-delay circuit breaker; an ordinary fuse is likely to burn out during the several seconds it takes for the element to heat up and the current to reach the steady-state "hot" current. Due to the uncertainty of the circuit protection scheme, manufacturers will limit the current, and thus the power level of appliances such as toasters to something less than the maximum theoretical capacity of the circuit. For example, a toaster with an 8 ohm steady state hot resistance will draw 1800 watts. More realistically, the device will be designed to draw 1200 watts, and thus its hot resistance will be 12 ohms.

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