Electric Circuits quiz
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What does adding a resistor in parallel do to total resistance?
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More questions about Electric Circuits
These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.
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Which law says $V = IR$?
Answer: Ohm's law
Why: Bulb filaments are no fixed resistors: lit, their resistance is about 15 times what it is when cold.
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How many volts does each of two identical series bulbs get from 12 V?
Answer: 6 volts
Why: The more bulbs in the row, the smaller each share: four on 12 volts get just 3 volts each, maybe too little to glow.
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What share of current flows down an 8-ohm path parallel to a 2-ohm one?
Answer: 20%
Why: Current divides by inverse resistance, so the 2-ohm path carries four times as much as the 8-ohm one, not all of it.
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Which letter stands for electric current in formulas?
Answer: I
Why: The I stands for the French 'intensité du courant', or current intensity.
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Which component's resistance falls sharply as it heats up?
Answer: Thermistor
Why: PTC thermistors do the opposite, gaining resistance as they heat, which makes them self-resetting overcurrent guards.
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How full is a charging capacitor after one time constant?
Answer: About 63%
Why: Discharging mirrors it: after one time constant only about 37% of the starting voltage is left.
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