GCE1A Residential Exam
Question 1 What is the standard formula for Ohm’s Law?
A) P = VI
B) E = IR
C) R = P / E
D) P = I²R
Answer: B
Explanation: Ohm’s Law states that voltage (E) equals current (I) multiplied by resistance (R).
Question 2 Which of the following is the unit of electrical current?
- Ohm
- Volt
- Ampere
- Watt
Answer: C
Explanation: The ampere (amp) is used to measure electrical current.
Question 3 Which device is used to measure electrical resistance?
- Voltmeter 1 / 4
GCE1A Residential Exam
- Ammeter
- Ohmmeter
- Wattmeter
Answer: C
Explanation: An ohmmeter measures resistance by passing a small current through the component and reading the voltage drop.
Question 4 What is the primary function of a resistor in a circuit?
- To store electrical charge
- To limit or control current
- To convert AC to DC
- To increase voltage
Answer: B
Explanation: Resistors limit the flow of current and drop voltage in circuits.
Question 5 Which term refers to the rate of energy consumption in a circuit?
- Voltage
- Current
- Resistance
- Power 2 / 4
GCE1A Residential Exam
Answer: D
Explanation: Power is the rate at which energy is used, measured in watts (W).
Question 6 What happens to current if you increase resistance while keeping voltage constant?
- It increases
- It stays the same
- It decreases
- It becomes zero instantly
Answer: C
Explanation: According to Ohm’s Law (I = E/R), increasing resistance decreases the current if voltage stays constant.
Question 7 Which of the following symbols represents resistance?
- I
- V
- R
- P
Answer: C
Explanation: The standard symbol for electrical resistance is R.
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GCE1A Residential Exam
Question 8 What is the most common cause of electrical shock in residential settings?
- Excess voltage on a neutral
- Faulty grounding or lack of grounding
- Overly large circuit breakers
- Low voltage systems
Answer: B
Explanation: Inadequate or faulty grounding is a leading cause of electrical shock because it fails to provide a safe path to ground.
Question 9 How is electrical voltage defined?
- The potential energy per unit charge
- The flow rate of electric current
- The opposition to current flow
- The rate of energy usage
Answer: A
Explanation: Voltage (electrical potential difference) is the potential energy per unit charge.
Question 10 What is the role of a capacitor in a circuit?
- It converts AC to DC
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