Electricity and Magnetism Review

Front

What happens to the resistance of a wire when its temperature increases?

Back

The resistance of the wire increases.

Front

From which areas do electric charges flow?

Back

Electric charges always flow from negative areas to positive areas.

Front

What is true about electric forces?

Back

Electrical forces act at a distance.

Front

What causes a compass needle to turn when placed near an electrical outlet?

Back

The electric current in the outlet produces a magnetic field.

Front

What is the charge of the plastic ink dots in a laser printer?

Back

The charge of the plastic ink dots is positive.

Front

What is resistance in an electrical context?

Back

Resistance is the opposition to the flow of electric current.

Front

What is the relationship between voltage, current, and resistance?

Back

Ohm's Law states that Voltage = Current x Resistance.

Front

What is a magnetic field?

Back

A magnetic field is a region around a magnetic material or a moving electric charge within which the force of magnetism acts.

Front

What is the unit of electric charge?

Back

The unit of electric charge is the Coulomb (C).

Front

What is the difference between conductors and insulators?

Back

Conductors allow electric current to flow easily, while insulators resist the flow of electric current.