Lesson D

Basic Electric Circuits

Review questions

1. Which electrical circuit can have no current?A. A closed circuit

B. A short circuit

C. An open circuit

D. A complete circuit

2. What type of electrical circuit is created when a fuse blows?A. A closed circuit

B. A bypass circuit

C. An open circuit

D. A short circuit

3. Which electrical circuit draws too much current?A. An open circuit

B. A dead circuit

C. A closed circuit

D. A short circuit

4. What term describes how fast electrical energy is used?A. Resistance

B. Current

C. Power

D. Voltage

5. If you have light bulbs marked 60 watts, 75 watts and 100 watts, which one will use more electrical energy in one hour?A. The 60 watt bulb

B. The 75 watt bulb

C. The 100 watt bulb

D. They will all be the same

6. What is the basic unit of electrical power?A. The ohm

B. The watt

C. The volt

D. The ampere

7. If a 100-ohm resistor is connected to 200 volts, what is the current through the resistor?A. 1 ampere

B. 2 amperes

C. 300 amperes

D. 20,000 amperes

8. If a current of 2 amperes flows through a 50-ohm resistor, what is the voltage across the resistor?A. 25 volts

B. 52 volts

C. 100 volts

D. 200 volts

9. If a current of 3 amperes flows through a resistor connected to 90 volts, what is the resistance?A. 3 ohms

B. 30 ohms

C. 93 ohms

D. 270 ohms

10. What formula shows how voltage, current and resistance relate to each other in an electric circuit?A. Ohm's Law

B. Kirchhoff's Law

C. Ampere's Law

D. Tesla's Law

11. Which of the following principles is used when working with almost any electronic circuit?A. Ampere's Law

B. Coulomb's Law

C. Ohm's Law

D. Tesla's Law