Goyal Brothers Prakashan solutions for A New Approach to ICSE Physics [English] Class 10 chapter 7 - Electric Circuits, Resistance and Ohm's Law [Latest edition]

A charge of 1000 C flows through a conductor for 3 min and 20 s. Find the magnitude of current flowing through the conductor.

A charge of 5000 C flows through an electric circuit in 2 hours and 30 minutes. Calculate the magnitude of current in a circuit.

A charge of 8860 C flows through an electric circuit in 2 min and 40 s. Calculate the magnitude of current in a circuit.

Define “quantity of charge”.

State SI unit of electric charge and define it.

One coulomb is equal to charge on 6.25 × 10¹⁸ electrons. What is magnitude of electric charge on a single electron?

What do you understand by the term electric current?

If Q is the electric charge which flows through a conductor in the time 't' such that 'I' is the magnitude of current, what is the relation between Q, t and I?

State and define the SI unit of electric current.

State one bigger and one smaller unit of electric current.

A charge of 1000 C flows through a conductor in 1 minute and 40 s. What is the magnitude of current flowing though conductor?

What do you understand by the term electric potential?

If 'W' is the amount of work done in bringing a Q unit of positive charge from infinity to given point in an electric field, such that 'V' is potential at that point, then what is the relation between W, Q and V?

State the unit of electric potential and define it.

400 joules of work is done in bringing a charge of 2 coulombs from infinity to a given point, what is the potential at that point?

State the mathematical expression for potential difference.

1000 J of work is done in moving 5 C of charge from point A to B. What is the potential difference between A and B?

Name the instrument which is used to measure the potential difference.

1. What do you understand by the term ‘closed electric circuit’?
2. Draw a diagram in support of your answer.

1. You switch off a glowing electric bulb in an electric circuit. What kind of circuit you have achieved, open electric circuit or closed electric circuit?
2. Define the answer in (a) and support your answer by a diagram.

Define the term resistance.

Name two bigger units of resistance.

Name two smaller units of resistance.

State the law of length for an electric resistance.

If l₁ and l₂ are the two length of same material and same area of cross-section such that R₁ and R₂ are their respective resistances then derive relation between R₁, R₂, l₁, l₂.

A conductor of length 80 cm has a resistance of 4.80 Ω, calculate the resistance of similar conductor of length 640 cm.

State the law of area of cross-section for an electric resistance.

If a₁ and a₂ are the area of cross-sections of the two conductors of length 'l' each, such that R₁ and R₂ are their electrical resistance derive a relationship between R₁, R₂, a₁ and a₂.