Basic Electrical Principles Flashcards

A wire carries 3 amperes of current for 10 seconds. How many coulombs of charge passed through the wire?

Answer: 30 coulombs

Charge (Q) = Current (I) × Time (t), so Q = 3 A × 10 s = 30 coulombs.

Which material is the BEST conductor of electricity?

Answer: Copper

Copper has very low electrical resistance and is one of the best practical conductors used in wiring.

If voltage across a resistor doubles while resistance stays the same, what happens to the current?

Answer: It doubles

By Ohm's Law (I = V/R), doubling V while R stays constant doubles the current.

What does a fuse do in an electrical circuit?

Answer: Breaks the circuit when current is too high

A fuse contains a wire that melts and breaks the circuit when current exceeds a safe level, preventing damage.

Two resistors of 6 ohms each are connected in series. What is the total resistance?

Answer: 12 ohms

In a series circuit, total resistance is the sum of all resistors: 6 + 6 = 12 ohms.

Which unit measures electrical power?

Answer: Watt

Power is measured in watts (W), where 1 watt equals 1 volt multiplied by 1 ampere.

In a parallel circuit with two identical bulbs, if one bulb burns out, what happens to the other?

Answer: It continues to glow normally

In a parallel circuit, each branch is independent, so the remaining bulb continues to receive full voltage.