Electricity and Magnetism Test CP

Front

What decreases the strength of the magnetic field around a wire?

Back

Using less loops around the iron core.

Front

What is the formula to calculate current (I) in a circuit?

Back

I = V/R, where I is current, V is voltage, and R is resistance.

Front

What is the current produced by a 9-volt battery flowing through a resistance of 0.2 ohms?

Back

45 amps.

Front

Which materials are good insulators of electric charge?

Back

Wood, plastic, and rubber are good insulators.

Front

Which material is NOT a good insulator of electric charge?

Back

Skin.

Front

In which direction does current flow?

Back

From negative to positive.

Front

What is the difference between series and parallel circuits?

Back

In series circuits, components are connected end-to-end, while in parallel circuits, components are connected across common points.

Front

What is the unit of electric current?

Back

Ampere (A).

Front

What is Ohm's Law?

Back

Ohm's Law states that V = I * R, where V is voltage, I is current, and R is resistance.

Front

What happens to the total resistance in a parallel circuit when more resistors are added?

Back

The total resistance decreases.