What p.d. is needed to send a current of 6 A through an electrical appliance having a resistance of 40 Ω

Keeping the potential difference constant, the resistance of a circuit is doubled. By how much does the current changes?

Why do electricians wear rubber hand gloves while working with electricity ?

An electric circuit consisting of a 0.5 m long nichrome wire XY, an ammeter, a voltmeter, four cells of 1.5 V each and a plug key was set up.

(i) Draw a diagram of this electric circuit to study the relation between the potential difference maintained between the points 'X' and 'Y' and the electric current flowing through XY.

(ii) Following graph was plotted between V and I values:

What would be the value of ratios when the potential differences us 0.8 V, 1.2 V and 1.6 V respectively?

What conclusion does you drawn from the values?

(iii) What is the resistance of the wire?

What is the ratio of potential difference and current known as?