Ohm's Law Questions and Answers
Ohm’s Law questions with answers form an essential part of electronics aptitude questions and answers for competitive exams like GATE, DRDO, and ISRO. This fundamental principle relates voltage, current, and resistance in an electrical circuit, helping engineers analyze circuit behavior. Understanding and applying Ohm’s Law is vital for solving numerical problems in electrical and electronics engineering. These aptitude questions with solutions simplify real-world electrical applications and build confidence for placement tests. Through detailed explanations and practice problems, learners can master this core electronics concept effectively.
Ohm's Law
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16 questions
1. "Half-splitting" is
- a means for nuclear fuel cells to produce electricity
- a means of isolating a problem in a circuit
- a means for reducing a high ac voltage to a low dc voltage
- a means of limiting current in a circuit
2. If doubling the voltage across a resistor doubles the current through the resistor then
- the resistor value decreased
- the resistor value did not change
- the resistor value increased
- it is impossible to determine the change in the resistor value
3. If the voltage across a fixed value of resistance is increased five times, what does the current do?
- It increases by a factor of five.
- It decreases by a factor of five.
- It stays the same.
- Not enough information
4. If the resistance in a circuit with constant voltage increases, the current will
- increase
- decrease
- stay the same
- Not enough information
5. What is the kilowatt-hour consumption of a 40 W lamp if it remains on for 1750 h?
- 43.75
- 70
- 43,750
- 70,000
6. A damaged resistor
- may appear burned
- may have an increased resistance value
- may be checked with an ohmmeter
- All of the above
7. Power supplies differ from batteries in that
- power supply output voltages are ac and not dc
- power supply voltages are not stable
- power supplies are low-current devices
- None of the above
8. If voltage across a resistance doubles
- the current is halved
- the resistance doubles
- the current is unchanged
- none of the above
9. Ohm's law describes the mathematical relationship between
- ohms, kilohms, and megohms
- resistor size and resistor value
- resistance, voltage, and current
- none of the above
10. Energy is defined as the ability to
- produce heat
- produce light
- produce sound
- All of the above