Understanding Electric Current

What happens to the light bulb in a circuit when the switch is closed?

• The light bulb flickers.

• The light bulb explodes.

• The light bulb remains off.

• The light bulb lights up.

What is the unit of electric current?

• Volt

• Ampere

• Ohm

• Coulomb

According to Ohm's Law, what does the symbol 'I' represent?

• Current

• Resistance

• Power

• Voltage

What is required to make electrons move through a wire?

• A vacuum

• A high temperature

• A potential difference

• A magnetic field

In which direction do electrons flow in a circuit?

• From negative to positive terminal

• From positive to negative terminal

• In a random direction

• In a clockwise direction

What did early scientists mistakenly believe about current flow?

• It did not exist.

• It flowed in a circular path.

• It was made up of positive charges.

• It was made up of negative charges.

What is the conventional direction of current flow?

• From negative to positive terminal

• From positive to negative terminal

• In a zigzag pattern

• In a spiral pattern

How is current quantitatively defined?

• The amount of voltage per unit time

• The amount of charge per unit time

• The amount of resistance per unit time

• The amount of power per unit time

If 600 coulombs of charge pass a point in 500 seconds, what is the current?

• 0.8 amperes

• 1.2 amperes

• 2.0 amperes

• 1.5 amperes

How many electrons pass a point in a circuit with a current of 2.5 amperes over 3.5 minutes?

• 3.28 x 10^21 electrons

• 2.00 x 10^21 electrons

• 1.50 x 10^21 electrons

• 5.00 x 10^21 electrons