Energy Test 24-25 Test Review (Circuits & Light)

Front

What is the principle of refraction?

Back

Refraction is the bending of light as it passes from one medium to another, caused by a change in its speed.

Front

What color reflects the most light?

Back

White reflects the most light.

Front

What color absorbs the most light?

Back

Black absorbs the most light.

Front

What is the function of a magnifying glass?

Back

A magnifying glass uses refraction to make items appear larger.

Front

What is the formula for calculating electrical power in a circuit?

Back

Power (P) = Voltage (V) x Current (I).

Front

What is Ohm's Law?

Back

Ohm's Law states that the current (I) through a conductor between two points is directly proportional to the voltage (V) across the two points, expressed as V = I x R, where R is resistance.

Front

What is the unit of electrical resistance?

Back

The unit of electrical resistance is the Ohm (Ω).

Front

What is the difference between series and parallel circuits?

Back

In a series circuit, components are connected end-to-end, so the same current flows through all components. In a parallel circuit, components are connected across the same voltage source, allowing multiple paths for current.

Front

What is the role of a resistor in a circuit?

Back

A resistor limits the flow of electric current in a circuit.

Front

What is the speed of light in a vacuum?

Back

The speed of light in a vacuum is approximately 299,792 kilometers per second (or about 186,282 miles per second).