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3 cards from this section. Quick, good the night before a test.
Define work in the context of electric circuits.
Think about the movement of charge.
What is the unit of power?
Recall what a Watt represents.
What is the formula for calculating power in terms of work and time?
Consider how we break down work over time.
True or False: Energy can be created or destroyed according to the law of conservation of energy.
Reflect on the general law of conservation.
A circuit consumes 300 W for 5 hours. What is the total energy consumed in kilowatt-hours? Calculate the cost if the energy rate is $0.12 per kWh.
Convert watts to kilowatts before calculating time!
If an appliance rated at 1200 W operates for 30 minutes, how much energy does it consume? What is the power loss if the resistance is 10 ohms?
Use the relationship between power, current, and voltage, remember V = I · R!
4 more questions in this section. Enroll free to practise them all.
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