Power Consumption & Cost

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Presentation transcript:

Power Consumption & Cost S1-3-21 Develop a formula for domestic power consumption costs, and solve related problems. Include: Cost = Power(Kw) x time (hr) x Price ($)

Cost of Power… In order to sell electrical power, we must have a way of calculating the cost of electricity. We do this by charging a certain price per unit of electrical energy. We get our electrical power from Manitoba Hydro. The power is primarily generated in northern Manitoba using large hydro-electric dams. Manitoba Hydro charges us for only the power that we use…so using less means saving money.

kWh = kilowatts x time (hours) Cost of Power… To charge us for power, MB Hydro must know how much power we use. They measure this in kilowatts (kW). 1 kW = 1000 Watts (divide Watts by 1000) They must know how much power we use during a certain amount of time. To do this, they measure how many kilowatt hours (kWh) we use. This is measured by the meter that is on the side of your house. We can also calculate the amount of kilowatt hours we use with the following equation: kWh = kilowatts x time (hours)

Cost of Power… To calculate cost, we use the following formula: Cost = kWh x price per kWh or Cost = Power x time x Price In Manitoba, we have some of the cheapest power in North America. This is because we have so much power to sell. Hydro sells us the power at a low rate, then sells the rest to other provinces and the U.S.A. at a higher rate. Hydro bills usually come every one to two months, and vary in amount depending on how much power is consumed.

Cost = Power(kW) x time(hr) x Price($) Examples… Cost = Power(kW) x time(hr) x Price($) Assume the price of electricity is 6¢ per kWh 1. Calculate the cost of leaving a 100W light on for 2 hours.

Cost = Power(kW) x time(hr) x Price($) Examples… Cost = Power(kW) x time(hr) x Price($) Assume the price of electricity is 6¢ per kWh 2. A T.V. is rated at 200W. You watch T.V. for 4 hours a day for a month. How much did it cost?

Cost = Power(kW) x time(hr) x Price($) Examples… Cost = Power(kW) x time(hr) x Price($) Assume the price of electricity is 6¢ per kWh 3. You use an appliance that draws 6A of current on an 110V system for 10 hours a day in February. How much does it cost?