Electrical Power Output

Electrical Power Output

Physics

​TSWBAT

​HP3E4 Use mathematical and computational thinking to analyze problems dealing with the power output of electrical devices.

​Importance of tracking Power

​- Calculate exactly how much it costs to operate electrical devices.

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​Formulas

​Power = Current x Voltage

​Current = Q (coulombs) / t (seconds)

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​Lets apply

​white boards, markers and eraser

​1.

​How much does it cost to operate a 695 W heater for exactly 30.0 min if electrical energy costs $0.06 per kW*h

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​Power = I x V

​I = Q/t

​2.

​A television that requires an average of 0.40 ampere of current is operated on a 120-volt service for 5.0 hours. How much energy is used?

​3.

​A light bulb requires 2 amps to produce light. The resistance of the bulb is 3 ohms. How many much does it cost to have this light on from 6:00 pm to 10:00 pm every day for one month if the rate of electric cost is $0.12 per kWh?

​4.

​A color TV draws about 2.5 A when it is connected to a 120 V outlet. Assuming electrical energy costs $0.060 per kW*h, what is the cost of running the TV for exactly 8 hrs?

​5.

​A microwave draws 5.0 A when it is connected to a 120 V outlet. If electrical energy costs $0.090 per kW*h, what is the cost of running the microwave for exactly 6 h?

​11/16 - Assignment

​11/16 - Quiz on Quizizz

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​Test pushed back to Thursday!

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​Review is tomorrow!