Question

(a) Name a device which helps to maintain a potential difference across the ends of a conductor.
(b) What is meant by saying that the potential difference between two points is 1 V?
(c) Define Ohm's law. Write an expression for it.
(d) What is the unit of resistance?
​(e) When the potential difference between the terminals of an electric heater is 110 V, a current of 5 A flows through it. What current will flow through the heater if the potential difference is increased to 220 V? What is the resistance of heater?

Answer 1

a. battery

A battery consisting of one or more electric cells is used to maintain a potential difference across. a conductor.

c. Ohm's law states that the voltage or potential difference between two points is directly proportional to the current or electricity passing through the resistance, and inversely proportional to the resistance of the circuit.

The formula for Ohm's law is V=IR.

d. The ohm (symbol: Ω) is the SI derived unit of electrical resistance, named after German physicist Georg Simon Ohm.

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Answer 2

Explanation:

(a) The Potential difference between the conductor ends is managed by connecting a battery or a dry cell to the conductor end.

(b) When 1 joule is made to move 1 Coulomb charge from one point to another, the potential difference between two points is  1V .

(c)Ohm's law :- The current flow is directly proportional to the difference in applied potential.

V ∝ I or V = IR

(d) The ohm resistance unit is indicated by $\Omega$.

(e)  V = IR (Ohms law)

$R = \frac{V }{I} = \frac{110 V}{ 5 A} = 22 \Omega$

the heater resistance is 22 $\Omega$.

$I = \frac{V}{R}$

 = 10 A

You can get all the answers of Chapter 7 in the link below:    

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