Bennett Mechanical Test Electricity and Circuits 3 — Questions and Answers
Question 1: Two 6-ohm resistors are connected in parallel. What is the total resistance?
- 3 ohms (Correct answer)
- 6 ohms
- 12 ohms
- 0.5 ohms
Correct answer: 3 ohms
For two equal resistors in parallel, total resistance is half of one, so 3 ohms.
Question 2: What is the unit of electrical power?
- Ohm
- Watt (Correct answer)
- Coulomb
- Henry
Correct answer: Watt
Electrical power is measured in watts, equal to volts times amps.
Question 3: What happens to total resistance when more resistors are added in series?
- It decreases
- It increases (Correct answer)
- It stays the same
- It becomes zero
Correct answer: It increases
Series resistances add together, so total resistance increases with each one.
Question 4: Which component stores electrical charge?
- Resistor
- Capacitor (Correct answer)
- Diode
- Switch
Correct answer: Capacitor
A capacitor stores charge on its plates and releases it when needed.
Question 5: What is the power consumed by a device drawing 2 amps at 120 volts?
- 60 watts
- 122 watts
- 240 watts (Correct answer)
- 0.0167 watts
Correct answer: 240 watts
Power equals voltage times current, so 120 V × 2 A = 240 W.
Question 6: A diode allows current to flow in how many directions?
- Both directions equally
- Only one direction (Correct answer)
- No directions
- Three directions
Correct answer: Only one direction
A diode permits current flow in only one direction, blocking the reverse.
Question 7: What is the purpose of a switch in a circuit?
- To store energy
- To open or close the current path (Correct answer)
- To increase voltage
- To measure resistance
Correct answer: To open or close the current path
A switch opens or closes the circuit to turn current on or off.
Bennett Mechanical Test Electricity and Circuits 3
Two 6-ohm resistors are connected in parallel.
What is the total resistance?