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Revision Worksheet 2 Ohms Law

The document provides examples of applying Ohm's Law to calculate values in various circuit scenarios. It includes examples of calculating resistance, current, and voltage given two of the three values. The examples demonstrate using Ohm's Law to find unknown values for circuits involving household appliances, car batteries, and other common devices operating at different voltages and resistances.

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Elina Mohabbati
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387 views2 pages

Revision Worksheet 2 Ohms Law

The document provides examples of applying Ohm's Law to calculate values in various circuit scenarios. It includes examples of calculating resistance, current, and voltage given two of the three values. The examples demonstrate using Ohm's Law to find unknown values for circuits involving household appliances, car batteries, and other common devices operating at different voltages and resistances.

Uploaded by

Elina Mohabbati
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Ohm’s Law Practice Worksheet

An alarm clock draws 0.5 A of current when If a toaster produces 12 ohms of resistance in a 120-
connected to a 120 volt circuit. Calculate its volt circuit, what is the amount of current in the circuit?
resistance.
I = 120 volts / 12 ohms
R = 120 volts / 0.5 A I= 10 amps
r= 240 ohms

A subwoofer needs a household voltage of 110 V A 12 Volt car battery pushes charge through the
to push a current of 5.5 A through its coil. What is headlight circuit resistance of 10 ohms. How
the resistance of the subwoofer? much current is passing through the circuit?
I=V/R
R = 110 volts / 5.5 A Current (I) = 12 Volts / 10 ohms
R = 20 ohms Answer: 1.2 Amps

A walkman uses a standard 1.5 V battery. How much How much voltage would be necessary to generate 10
resistance is in the circuit if it uses a current of 0.01A? amps of current in a circuit that has 5 ohms of
resistance?
R=V/I
Resistance (R) = 1.5 Volts / 0.01 Amps V=I*R
Answer: 150 ohms Voltage (V) = 10 Amps * 5 ohms
Answer: 50 Volts

A circuit contains a 1.5 volt battery and a bulb with


a resistance of 3 ohms. Calculate the current. An electric heater works by passing a current of 100 A
though a coiled metal wire, making it red hot. If the
I=V/R resistance of the wire is 1.1 ohms, what voltage must
Current (I) = 1.5 Volts / 3 ohms be applied to it?
Answer: 0.5 Amps
V=I*R
Voltage (V) = 100 Amps * 1.1 ohms
What current flows through a hair dryer plugged into
Answer: 110 Volts
a 120 Volt circuit if it has a resistance of 25 ohms?

120 Volts / 25 ohms A light bulb has a resistance of 5 ohms and a


Answer: 4.8 Amps maximum current of 10 A. How much voltage can be
applied before the bulb will break?
V=I*R
Maximum Voltage (V) = 10 Amps * 5 ohms
Answer: 50 Volts

What happens to the current in a circuit if a 1.5-volt What happens to the current in a circuit if a 10Ω
battery is removed and is replaced by a 3-volt battery? resistor is removed and replaced by a 20Ω
The current in the circuit increases if a 3-volt battery resistor?
is used instead of a 1.5-volt battery. The current in the circuit decreases if a 20Ω
resistor is used instead of a 10Ω resistor.
Suppose you did a lab with this simple circuit and got the following data. Plot the points of the provided graph.

Voltage (V) Current (A)


0.65 0.12
1.41 0.29
2.55 0.51
V R
I 3.28 0.67
4.11 0.81
6.15 1.23

What mathematical relationship do you see between voltage and


current?
when the voltage and current increase together.

resistance constant? no, the resistance is different for every


voltage and current pair.

Solve for the unknown in each of these circuits

12V 10Ω 10Ω R=?


V=? 120V
I=? 5A 5A

I=1.2 amps r= 24 ohms


v= 50 volts

R=? 480Ω V=? 150Ω


10V 24V
20A I=? 1A

r=0.5 ohms v=150 volts


I=0.05 amps

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