Electrical and Electronic Knowledge Flashcards
6 cards from real IST practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Electrical and Electronic Knowledge flashcards as text
What is the standard unit of measurement for electrical resistance?
Answer: Ohm
Electrical resistance is measured in Ohms, named after German physicist Georg Ohm.
According to Ohm's Law, if voltage is 120V and resistance is 30 Ohms, what is the current?
Answer: 4 A
Ohm's Law: Current (I) = Voltage (V) ÷ Resistance (R) = 120 ÷ 30 = 4 Amps.
What color is the standard neutral wire in US residential and light commercial wiring?
Answer: White or gray
White or gray wires are the standard colors for neutral conductors in US electrical wiring.
What device is used to protect an electrical circuit from damage caused by excess current?
Answer: Fuse or circuit breaker
Fuses and circuit breakers protect circuits by interrupting the flow of current when it exceeds a safe level.
What is the purpose of a ground wire in an electrical circuit?
Answer: To provide a safe path for fault current
The ground wire provides a safe low-resistance path for fault current, protecting people from electric shock.
If two resistors of 10 Ohms each are connected in series, what is the total resistance?
Answer: 20 Ohms
In a series circuit, total resistance equals the sum of individual resistances: 10 + 10 = 20 Ohms.
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