Chapter 11: Electricity   

Question: A current of 0.5 A is drawn by a filament of an electric bulb for 10 minutes. Find the amount of electric charge that flows through the circuit. [1M]
Solution : Here,  I = 0.5 A  , t = 10 min = 600 second  and Q = ?
We know that ,   Q = It
Q = 0.5 A × 600 s
Q = 300 C

Question: What does an electric circuit mean ? [1M]

Answers:  A continuous and closed path of an electric current is called an electric circuit.
Question: Define the unit of current. [1M]

Answers: One ampere (the unit of current) is constituted by the flow of one coulomb of charge per second .
Question: Calculate the number of electrons constituting one coulomb of charge . [1M]

Solution: Here, ,

The number of electron

Question: How much work is done in moving a charge of 2 C across two points having a potential difference 12 V ? [1M]
Solution : Here,  Q = 2 Coulomb  , V = 12 volt  and W = ?
W = VQ
= 12 V × 2 C
= 24 J