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In the following activity, look at the equation related to voltage and electricity. When solving questions about electricity, you may have to alter an equation and/or use more than one equation. First, look at the voltage equation, and then investigate other equations connected to electricity to see how they connect with the voltage equation.

The Voltage Equation

Take a few moments to review the voltage equation and the relationships among current, voltage, and resistance in the simulation below. Drag the sliders for voltage and resistance to observe the changes.

This activity might not be viewable on your mobile device. Interactive exercise. Assistance may be required.

V = Voltage I = Current R = Resistance

Source: Ohm’s Law, University of Colorado at Boulder PhET Simulation

In your notes, answer the following questions:

What happens to the voltage if you increase resistance?
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Check Your Answer
The voltage decreases.
What happens to the voltage if you decrease resistance?
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Check Your Answer
The voltage increases.
What happens to the current as the voltage is increased?
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Check Your Answer
The current increases.
What happens to the current as the voltage is decreased?
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Check Your Answer
The current decreases.

Interactive exercise. Assistance may be required. Use the equations and information below to fill out the following chart. For this activity, drag the information you currently have and the equations you will need in order to solve the problem into the appropriate box. Note: You may not use all of the variables and equations provided. For both problems, you are looking for the voltage.