Ohm’s Law Notes JAN 7. Vocabulary current : how quickly the electrons are flowing through the circuit; units: amperes (A) voltage : the electric potential.

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Presentation transcript:

Ohm’s Law Notes JAN 7

Vocabulary current : how quickly the electrons are flowing through the circuit; units: amperes (A) voltage : the electric potential energy that pushes the electrons; units: volts (V) resistance: an effect of the parts of the circuit that slow down the electrons; units: ohms (Ω)

Ohm’s Law In any circuit voltage = current ( I ) x resistance

Practice Problems. 1. What is voltage if current is 1.5 amperes and resistance is 30 ohms? 2. What is the current flowing through a wire if the resistance is 20 ohms and the voltage is 40 volts? 3. What is a wire’s resistance if a current of 0.5 amperes flows through a wire and the voltage is 50 volts?

Electrical Power  For any circuit the Power = voltage x current  Units of Power: Watts

How do you pay for Power?  First calculate electric power in watts Then multiply watts by hours, and divide by 1000 to get kilowatts  You pay by the kilowatt-hr

Practice problems 4. Your clothes dryer has 220V running into it and a current of about 18A. How much Power does it use? 5. How much energy in kilowatt hours do you pay for if the dryer is used for 1.5hours?