Question

(11) medium A.
Q.21. (a) What do you mean by "potential difference between two points" in a conductor ?
Name a device that helps to maintain a potential difference across a conductor. What is its
unit?
(6) Name the instrument used to measure (i) electric current in a circuit, (ii) potential
difference between two points in a circuit.
(c) The resistance of a resistor is kept constant and the potential difference across its two
ends is decreased to half of its former value. State the change that will occur in the current
flowing through it.
(d) A given length of a wire is doubled on itself. By what factor does the resistance of the
wire change?​

Answer 1

Answer:

hey mate

Explanation:

a. Potential difference between any two points is defined as the amount of work done in moving a unit charge from one point to another

cell help in maintaining a potential difference across a conductor. This makes the current flow.

cell is single unit

6)i. ammeter is used to measure a electric current in a circuit

ii.voltmeter is used to measure potential difference and

c) Therefore, the amount of current flowing through the electrical component is reduced by half

d) Resistance of a wire is directly proportional to the length of the wire. As its length increases it's resistance increases. If it is doubled again, the length of the wire becomes 4L and it's resistance becomes 4x.

hope it help u