6. Determine the power dissipated by the element of an electric fire of resistance 20 ohms when a current of 10A flows through. If the fire is on for 6 hours, determine the energy used and the cost if...

Extracted text: 6. Determine the power dissipated by the element of an electric fire of resistance 20 ohms when a current of 10A flows through. If the fire is on for 6 hours, determine the energy used and the cost if 1 unit of electricity costs P 0.65. 7. A business uses two 3kW fires for an average of 20 hours each per week and six 150W lights for 30 hours each per week. If the cost of electricity is P 0.64 per unit, determine the weekly cost of electricity to the business.