Exam 5 - electricity

Front

What is alternating current (AC)?

Back

Current that moves in one direction and then the reverse direction within a circuit.

Front

How do you calculate voltage using Ohm's Law?

Back

Voltage (V) = Current (I) × Resistance (R).

Front

What is the resistance of a circuit if the voltage is 6 V and the current is 2 A?

Back

Resistance (R) = Voltage (V) / Current (I) = 6 V / 2 A = 3 Ω.

Front

What is a magnetic field?

Back

A field surrounding an object that is directed away from the north pole and towards the south pole.

Front

How does a rotating coil generate electricity?

Back

The rotating coil allows a different amount of magnetic field lines through the loop while it spins, inducing an electric current.

Front

What is the formula for calculating the secondary voltage in a transformer?

Back

Vs/Vp = Ns/Np, where Vs is secondary voltage, Vp is primary voltage, Ns is number of turns in secondary coil, and Np is number of turns in primary coil.

Front

If a primary coil has 10 loops and a secondary coil has 20 loops, what is the relationship between primary and secondary voltage?

Back

The secondary voltage is double the primary voltage.

Front

What is the unit of electric current?

Back

Ampere (A).

Front

What is the unit of voltage?

Back

Volt (V).

Front

What is the unit of resistance?

Back

Ohm (Ω).