Electric power is the rate at which electrical energy is transferred by an electric circuit. It's measured in watts (W). Resistance, on the other hand, is the opposition that a substance offers to the flow of electric current. It's measured in ohms (Ω). Understanding how these two concepts relate is key to understanding circuits. A fundamental relationship is defined by the formula: $P = I^2R$, where P is power, I is current, and R is resistance. Also Ohm's law states that $V = IR$, where V is voltage.
Match the terms with their definitions:
| Term | Definition |
|---|---|
| 1. Resistance | A. The rate at which electrical energy is transferred. |
| 2. Current | B. The potential difference that drives electric current. |
| 3. Voltage | C. The opposition to the flow of electric current. |
| 4. Power | D. The flow of electric charge. |
| 5. Ohm's Law | E. $V=IR$. |
Answers: 1-C, 2-D, 3-B, 4-A, 5-E
Complete the following paragraph using the words: Ohms, Volts, Current, Power, Resistance.
__________ is the rate at which electrical energy is transferred and is measured in Watts. __________ is the flow of electric charge. __________ is the opposition to current flow. __________ law describes the relationship between Voltage, Current, and Resistance. Voltage is measured in __________, and Resistance is measured in __________.
Answers: Power, Current, Resistance, Ohm's, Volts, Ohms.
If you increase the voltage in a circuit while keeping the resistance constant, what happens to the current? Explain your answer using Ohm's Law.
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