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Kreutter: Circuits Ohm’s Law Problem-Solving Practice I = ∆V/R 1. You hook a 1.5-V battery up to a light bulb that has a resistance of 10 Ω. What is the current in the circuit? 2. You change the battery in the above circuit (keeping the same resistor) and the current is now 0.9 A. What is the voltage provided to the circuit by the battery? 3. You have a circuit that is drawing a current of 3.5 A. If the voltage provided by the battery is 12 V, what is the total resistance of the circuit? 4. Draw a circuit that includes a battery, a 25-Ω resistor, and an ammeter in series. If the ammeter reads .12 A, what is the voltage of the battery? What would a voltmeter read that is connected across the resistor? Kreutter: Circuits 5. What if the above problem, instead of having one 25-Ω resistor, has 2 12.5-Ω resistors connected in series? Would the ammeter reading change? What would a voltmeter that is connected across one of the resistors read? USE 120 V for the following problems (everything is plugged into a household outlet): 6. A 60 watt light bulb uses 0.5 A. R = __________ Ohms (Ω) 7. A blender uses 2 A 8. A microwave oven uses 8.3 A R = __________ Ω R = __________ Ω 9. A TV has 36 Ohms (Ω) of resistance 10. A toaster has 40 Ω of resistance __________ A 11. A fridge has 13.8 Ω of resistance I = __________ A I = I = __________ A

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