Question

What will be the effect of change in the lenght and thickness of the electrical wire in the experiment of electric current ,potential difference ,electric resistance

Answer 1

Thickness and length Electrical wires are made in such way that it can sustain with the respective potential difference and current flow through it.

• Resistance of a wire causes the flow of current.
• Resistance of a wire is directly proportional to its length and inversely proportional to its cross sectional area.

→  If the electrical pressure across a wire or potential difference across a wire kept constant then by increasing resistance causes decrease in rate of current flow, resistance causes voltage drop in it and power is dissipated in form of heat. Thus by creating voltage drop it reduces the rate flow of current in that wire.

→ If resistance decreases by keeping the length same and increasing the cross sectional area then the rate of flow of current through the wire increases and so that where high current is needed then cross sectional area of the wire should be high and vice versa.

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