Current

Question 1

What is electric current?

Answer 1

Electric current is the flow of electric charge, typically measured in amperes.

Question 2

True or False: Current can flow through both conductors and insulators.

Answer 2

False

Question 3

Fill in the blank: The unit of electric current is called the ______.

Answer 3

ampere

Question 4

What is the formula to calculate current?

Answer 4

Current (I) = Voltage (V) / Resistance (R)

Question 5

What device is used to measure electric current?

Answer 5

An ammeter

Question 6

In which direction does conventional current flow?

Answer 6

From positive to negative

Question 7

What is the difference between alternating current (AC) and direct current (DC)?

Answer 7

AC changes direction periodically, while DC flows in one direction.

Question 8

Multiple choice: What is the typical range of household current in amperes? (A) 1-5 A, (B) 10-20 A, (C) 30-40 A

Answer 8

B) 10-20 A

Question 9

True or False: Current can exist without voltage.

Answer 9

False

Question 10

What is the relationship between current and resistance in a circuit?

Answer 10

According to Ohm’s law, current is inversely proportional to resistance.

Question 11

Fill in the blank: The flow of electrons constitutes ______.

Answer 11

electric current

Question 12

What is the term for the opposition to the flow of current?

Answer 12

Resistance

Question 13

What is the SI unit of resistance?

Answer 13

Ohm

Question 14

Multiple choice: Which of the following materials is a good conductor of electricity? (A) Rubber, (B) Copper, (C) Wood

Answer 14

B) Copper

Question 15

What is a short circuit?

Answer 15

A short circuit occurs when current flows along an unintended path with little or no resistance.

Question 16

True or False: Higher voltage results in higher current, assuming resistance remains constant.

Answer 16

True

Question 17

What is the term for the rate at which electric charge flows?

Answer 17

Current

Question 18

Fill in the blank: A circuit must be ______ for current to flow.

Answer 18

closed

Question 19

What does a circuit breaker do?

Answer 19

A circuit breaker interrupts the flow of current to prevent overload.

Question 20

Multiple choice: What happens to current if resistance is doubled while voltage remains constant? (A) It doubles, (B) It halves, (C) It stays the same

Answer 20

B) It halves

Question 21

What is the name of the law that states current is directly proportional to voltage and inversely proportional to resistance?

Answer 21

Ohm’s law

Question 22

True or False: In a parallel circuit, the current is the same through all components.

Answer 22

False

Question 23

What happens to the total current in a series circuit?

Answer 23

It remains the same throughout the circuit.

Question 24

What is meant by ‘current rating’ of a device?

Answer 24

It refers to the maximum current a device can safely carry.

Question 25

Fill in the blank: A ______ is a device that allows current to flow in one direction only.

Answer 25

diode

Question 26

What is the primary purpose of a fuse in an electrical circuit?

Answer 26

To protect the circuit from excessive current.

Question 27

Multiple choice: Which type of current is commonly used in household outlets? (A) AC, (B) DC

Answer 27

A) AC