All of Topic one + Topic 2

Front

What is the color of an opaque object determined by?

Back

The color of an opaque object is determined by the color of light it reflects.

Front

What is resistance in electrical terms?

Back

Resistance is the measurement of how difficult it is for charges to flow through an object.

Front

What is the focal point in optics?

Back

The focal point is the point at which light rays parallel to the optical axis meet after being reflected or refracted by a mirror or lens.

Front

Which type of material does electric current flow best through?

Back

Electric current flows best through metals.

Front

What is voltage?

Back

Voltage is the difference in electrical potential energy per charge between two places in a circuit.

Front

What happens to light when it hits an opaque object?

Back

Light is either absorbed or reflected by an opaque object.

Front

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

Back

According to Ohm's Law, voltage (V) = current (I) × resistance (R).

Front

What is an example of a good conductor of electricity?

Back

Copper is an example of a good conductor of electricity.

Front

What is the role of a lens in optics?

Back

A lens refracts light to focus it or spread it out.

Front

What is the difference between current and voltage?

Back

Current is the flow of electric charge, while voltage is the potential difference that drives the current.