Q: If the proton beam in the previous question runs for $$5\ \mu\mathrm{s}$$, how much total charge is delivered?

$$2 \times 10$$^{-5}$$\ \mathrm{C}$$

Question 1

Which of the following best defines electric current?

Accepted Answer

The rate of flow of electric charge through a material.

Question 2

In a metal wire, which particles are primarily responsible for carrying electric current?

Accepted Answer

Electrons

Question 3

What is the unit of electric current?

Accepted Answer

Ampere (A)

Question 4

Which equation correctly relates charge, current, and time?

Accepted Answer

$$Q = I 	imes t$$

Question 5

A wire carries a current of $$3\ \mathrm{A}$$ for $$2$$ minutes. How much charge passes through it?

Accepted Answer

$$360\ \mathrm{C}$$

Question 6

A smartphone battery delivers $$2000\ \mathrm{mA} of $$current for $$1.5$$ hours. What is the total charge supplied?

Accepted Answer

$$10,800\ \mathrm{C}$$

Question 7

If a charge of $$30\ \mathrm{C}$$ passes through a conductor in $$5\ \mathrm{s}$$, what is the electric current?

Accepted Answer

$$6\ \mathrm{A}$$

Question 8

A wire carries a constant current of $$2.5\ \mathrm{A}$$ for $$1$$ minute. Calculate the total charge that flows through the wire.

Accepted Answer

$$150\ \mathrm{C}$$

Question 9

An electric device draws a current of $$500\ \mathrm{mA}$$ for $$10$$ minutes. How much charge passes through the device?

Accepted Answer

$$300\ \mathrm{C}$$

Question 10

If each electron carries a charge of $$1.6 	imes 10$$^{-19}$$\ \mathrm{C}$$, how many electrons flow through a device when $$300\ \mathrm{C} of $$charge passes?

Accepted Answer

$$1.88 	imes 10$$^{22}$$

Question 11

A smartphone battery requires $$9,000\ \mathrm{C} of $$charge to fully charge. If the charging current is $$1.5\ \mathrm{A}$$, how long (in hours) will it take to charge the battery from $$0\% to$$ $$100\%$$?

Accepted Answer

$$1.67$$ hours

Question 12

In a particle accelerator, a beam of protons carries $$2.5 	imes 10$$^{19}$$ protons per second. What is the current if each proton has a charge of +1.6$$ 	imes $$10^{-19}$$\ \mathrm{C}$$?

Accepted Answer

$$4\ \mathrm{A}$$

Question 13

If the proton beam in the previous question runs for $$5\ \mu\mathrm{s}$$, how much total charge is delivered?

Accepted Answer

$$2 	imes 10$$^{-5}$$\ \mathrm{C}$$

Question 14

Which statement best describes the direction of conventional current in a circuit?

Accepted Answer

Opposite to electron flow

Question 15

Why is understanding electric current important in real-world applications? Choose the best answer.

Accepted Answer

It helps in designing efficient electrical devices and ensuring safety.

Question 16

Which of the following is a real-life example of electric current?

Accepted Answer

A battery powering a flashlight

Question 17

Direct current (DC) flows:

Accepted Answer

In one direction only

Question 18

If a current of $$0.75\ \mathrm{A}$$ flows for $$20$$ seconds, how much charge is transferred?

Accepted Answer

$$15\ \mathrm{C}$$

Question 19

Which of the following statements is true about the movement of electrons and conventional current in a simple circuit?

Accepted Answer

Electrons move from negative to positive, while conventional current is from positive to negative.

Electric Current: Definition, Direction, and Calculations

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