Question

A cooker has a power rating of 3kW. If a unit of electricity costs 20cents, how...

A cooker has a power rating of 3kW. If a unit of electricity costs 20cents, how much does it cost to run the appliance for 3 hours?



A washing machine has a power-rating of 2.5kW. If a unit of electricity costs 24cents, how much does it cost to run the appliance for 1.5hours?


How much does it cost to run a .002kW clock for 1 year (365.25days) if it costs 3.53 cents/kWh?




A small electric furnace that expends 2.00kW of power is connected across a potential difference (aka. voltage) of 120V. a. What is the current in the circuit?




b. What is the resistance of the furnace?




c. What is the cost of operating the furnace for 24h at 7.00 cents/kWh?

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