Post Test (2) Physical Science

Front

What is Voltage?

Back

Voltage is the electric potential difference between two points in a circuit, measured in volts (V). It is the force that pushes electric charges through a conductor.

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 and inversely proportional to the resistance (R) of the conductor. It can be expressed as V = I × R.

Front

What is Resistance?

Back

Resistance is a measure of the opposition to the flow of electric current in a conductor, measured in ohms (Ω).

Front

How do you calculate Voltage in a circuit?

Back

Voltage can be calculated using Ohm's Law: V = I × R, where V is voltage, I is current in amperes, and R is resistance in ohms.

Front

What is Current?

Back

Current is the flow of electric charge in a circuit, measured in amperes (A).

Front

What is the relationship between Voltage, Current, and Resistance?

Back

According to Ohm's Law, if the resistance in a circuit remains constant, an increase in voltage will result in an increase in current.

Front

What happens to current if both voltage and resistance are doubled?

Back

The current remains the same because according to Ohm's Law, I = V/R. If both V and R are doubled, the ratio remains unchanged.

Front

What are sound waves?

Back

Sound waves are mechanical waves that require a medium (solid, liquid, or gas) to travel through. They are longitudinal waves characterized by compressions and rarefactions.

Front

What are light waves?

Back

Light waves are electromagnetic waves that can travel through a vacuum and do not require a medium. They are transverse waves.

Front

What is the difference between mechanical and electromagnetic waves?

Back

Mechanical waves require a medium to travel through (e.g., sound waves), while electromagnetic waves can travel through a vacuum (e.g., light waves).