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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