Quarter 3 Exam

A 50-ohm resistor is connected across a 50 V battery. What is the current in the circuit?

• 1 A

• 100 A

• 2500 a

• 50 A

Which of the following statements is true about electric power?

• Electric power is directly proportional to current and resistance.

• Electric power is directly proportional to voltage and current.

• Electric power is directly proportional to voltage and resistance.

• Electric power is inversely proportional to voltage and current.

Which of the following statements is true about voltage?

• Voltage is the energy per unit charge required to move a charge from one point to another in an electric field.

• Voltage is the force per unit charge at a point in an electric field.

• Voltage is the electric potential energy per unit charge at a point in an electric field.

• Voltage is the electric field strength at a point in space.

What is Ohm's law?

• Voltage is directly proportional to current and inversely proportional to resistance.

• Current is directly proportional to voltage and inversely proportional to resistance.

• Resistance is directly proportional to voltage and inversely proportional to current.

• Resistance is directly proportional to current and inversely proportional to voltage.

What is the unit of resistance?

• Ampere

• Ohm

• Volt

• Watt

Which of the following statements is true about the resistance of a wire?

• Resistance is directly proportional to the length of the wire and inversely proportional to its cross-sectional area.

• Resistance is directly proportional to the cross-sectional area of the wire and inversely proportional to its length.

• Resistance is directly proportional to both the length and cross-sectional area of the wire.

• Resistance is inversely proportional to both the length and cross-sectional area of the wire.

Which of the following best describes the concept of electric current?

• The flow of electrons through a conductor.

• The force that causes electric charges to move through a conductor.

• The energy associated with electric charges due to their position or motion.

• The potential energy per unit charge associated with a point in space where an electric charge is located.

Which of the following materials is a good conductor of electricity?

• Rubber

• Copper

• Glass

• Plastic

Which of the following best describes an electric field?

• A region around an electrically charged object where the electric potential is zero.

• A region around an electrically charged object where no electrical forces are present.

• A region around an electrically charged object where a force would be exerted on other charged objects.

• A region around an electrically charged object where the electric potential is highest.

What is the SI unit of electric charge?

• Volt

• Ohm

• Ampere

• Coulomb