Activity A:

Ohm’s law
Click Clear. Create the circuit shown at right. (Use the 20-ohm resistor.)
Click on the battery. Set the Selected battery voltage to 15 volts.
Introduction: Resistors are devices that slow the flow of current in a wire. The resistance of the circuit to current is measured in units called ohms.

Question: What is the relationship between voltage, current, and resistance?

Form hypothesis: How do you think increasing the resistance in a circuit will affect the current in the wire?

Ohm's law states that the current flowing through a conductor is directly proportional to the voltage applied across it, and inversely proportional to the resistance of the conductor. In other words, increasing the voltage in a circuit will increase the current flow, while increasing the resistance will decrease the current flow.