How do I know how much an appliance costs to run?

How do I know how much an appliance costs to run?

Electrical appliances are rated in watts (W) or kilowatts (kW). For example, a 100W globe left running for 10 hours would use 1 kWh of electricity, while a 1 kW-rated portable heater switched on for 5 hours would use 5 kWh of energy.

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