Fundamentals of Electricity and Magnetism

What is the unit of electric current?

• Volt

• Ampere

• Ohm

• Watt

Which material does not allow electricity to flow through easily?

• Copper

• Rubber

• Aluminum

• Gold

What is the direction of the magnetic field around a straight conductor carrying current?

• Parallel to the conductor

• Perpendicular to the conductor

• In the direction of the current

• Opposite to the direction of the current

According to Ohm's Law, what is the relationship between voltage (V), current (I), and resistance (R)?

What is the principle of electromagnetic induction?

• A voltage is induced in a circuit whenever it is exposed to a magnetic field

• A magnetic field is induced around a current-carrying conductor

• A current is induced in a circuit whenever it is exposed to a static magnetic field

• A voltage is induced in a circuit whenever there is a change in magnetic flux

In a series circuit with three resistors, if one resistor is removed, what happens to the total current?

• It increases

• It decreases

• It remains the same

• It stops

In a parallel circuit, how does the voltage across each branch compare?

• It varies from branch to branch

• It is zero

• It is the same across all branches

• It is highest in the branch with the least resistance

What is the total resistance in a parallel circuit with two resistors of 4 ohms and 6 ohms?

• 10 ohms

• 2.4 ohms

• 5 ohms

• 24 ohms

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

• It decreases

• It increases

• It remains the same

• It first increases then decreases

What is the SI unit of magnetic flux?

• Tesla

• Weber

• Ampere-turn

• Henry