Electronics-Ohm's Law Question and Answer
Electronics-Ohm's Law Question and Answer
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