Ohm’s Law Simulation

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This material was developed with funding from the
National Science Foundation under Grant # DUE 1601612

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100 Ohm

50 Ohm

200 Ohm

The opposite is true regarding electric resistance. If circuit resistance is 100 ohms and current is 1 Amp, an increase of resistance to 200 ohms (doubles) with no change in circuit voltage would cause the current to decrease by half to 0.5 Amps.
I = E/R
100 volts/ 100 ohms = 1 Amp
100 volts / 200 ohms = 0.5 Amps
If circuit resistance is 100 ohms and current is 1 Amp, a decrease of resistance to 50 ohms (half) with no change in circuit voltage would cause the current to double by to 2 Amps.
100 volts / 50 ohms = 2 Amps

Jasmine: when lightbulb50 is dropped in the socket the timeline to play at 00:03.00
when lightbulb100 is dropped in the socket the timeline to play at 00:01.00
when lightbulb200 is dropped in the socket the timeline to play at 00:02.00

Pick a bulb and place it in the socket.

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Effect of Changing Resistance

Ohm's Law Simulation

brighter

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no change

Drag and drop this lightbulb into the circuit to see what happens

Now You Try

increase

What happens to the brightness of the lightbulb if you use a 50 Ohm lightbulb?
What does the ammeter do?

decrease

Jasmine: when lightbulb50 is dropped in the socket the timeline to play at 00:01.00

dimmer

Click to turn the volt meter up and down

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200 volts/ 100 ohms = 2 Amps

250 volts/ 100 ohms = 2.5 Amps

300 volts/ 100 ohms = 3 Amps

Effect of Changing Voltage

If circuit voltage is 100 volts and current is 1 Amp, an increase of voltage to 200 volts (doubles) with no change in circuit resistance would cause the current to double to 2 Amps.
I = E/R
100 volts/ 100 ohms = 1 Amp
200 volts / 100 ohms = 2 Amps
If circuit voltage is 100 volts and current is 1 Amp, a decrease of voltage to 50 volts (half) with no change in circuit resistance would cause the current to drop by half to 0.5 Amps.
50 volts / 100 ohms = 0.5 Amps

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What happens to the brightness of the lightbulb if you use a 200 Ohm lightbulb?
What does the ammeter do?

Jasmine: when lightbulb200 is dropped in the socket the timeline to play at 00:01.00

400 Ohm

Jasmine: when lightbulb400 is dropped in the socket the timeline to play at 00:01.00

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What happens to the brightness of the lightbulb if you use a 400 Ohm lightbulb?
What does the ammeter do?

100 volts/ 100 ohms = 1 Amp

150 volts/ 100 ohms = 1.5 Amps

50 volts/ 100 ohms = 0.5 Amps

100 volts / 200 ohms = 0.5 Amps

100 volts / 50 ohms = 2 Amps

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Ohm’s law enables engineers and technicians to predict the effect of changes in an electrical circuit. It also enables them to determine the cause and effect of circuit faults and failures. Let’s see if you can predict the change in an electrical circuit using ohm’s law.

What does the ammeter do?

What happens to the lightbulb if you turn up the voltage meter?

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What happens to the lightbulb if you turn down the voltage meter?

What does the ammeter do?