7.2 V1SO

1. What is the mathematical equation of Ohm's Law?

• a. I = R/E

• b. R = I/R

• c. E = R/I

• d. I = E/R

2. What is the current of a circuit if the voltage is 2.6 volts and the resistance is 2 ohms?

• a. 1.3 amperes.
• b. 0.77 amperes.
• c. 7.7 amperes.
• d. 3.1 amperes.

3. What voltage is required to properly light a lamp having a resistance of 12 ohms and a current rating of 1 ampere?

• a. 12 volts.

• b. 24 volts.

• c. 1.2 volts.

• d. 2.1 volts.

4. What is the resistance in a circuit if there is a 24-volt source and the circuit draws 5 amperes of current?

• a. 0.48 ohms.

• b. 0.20 ohms.

• c. 4.8 ohms.

• d. 8.4 ohms.

5. Power is equal to the voltage across a circuit multiplied by the current through the circuit. How can you express this statement in a formula?

• a. I=EP

• b. E=PI

• c. P=IE

• d. I=PE

6. What is the power in a circuit if the current is 3 amperes and the voltage is 9.5 volts?

• a. 2850 watts.

• b. 2.85 watts.

• c. 28.5 watts.

• d. 285 watts.

7. What is the formula that states Joule's Law?

• a. R=E/P2

• b. I=P/E

• c. Heat = R2IT

• d. Heat = I2RT

8. What is the formula that expresser the following statement? 8. If you decrease the current or voltage in a circuit bag one-half, the power will decrease to one-fourth of its original valve.

• a. R=P2I
• b. P=I4R
• C. I=R2P
• d. P=I2R

9. A circuit has a current of 6 amperes and a resistance of 30 ohms. What is the power?

• a. 108.0 watts.

• b. 1080 watts.

• C. 1.080 watts.

• d. 10.80 watts.