Electric Current and Its Effects — Practice

Question 1

Draw the circuit symbols for: cell, bulb, open switch, closed switch.

Accepted Answer

Cell: a long line and a short thick line. Bulb: a circle with a cross. Open switch: two dots with a gap. Closed switch: two dots joined by a line.

Question 2

What is the heating effect of electric current? Give two applications.

Accepted Answer

When current flows through a conductor, it produces heat. Applications: electric iron and electric heater (also bulb filament).

Question 3

Describe how an electromagnet is made and how its strength can be increased.

Accepted Answer

Wind insulated copper wire around a soft iron core and pass current through it. Strength increases by adding more turns, increasing the current, or using a soft iron core.

Question 4

Differentiate between a fuse and an MCB.

Accepted Answer

A fuse has a wire that melts at excess current and must be replaced. An MCB is a switch that trips at excess current and can be reset by switching it back on.

Question 5

Why is an electromagnet used in a scrap yard crane instead of a permanent magnet?

Accepted Answer

An electromagnet can be switched on to lift iron scrap and switched off to release it, and its strength can be adjusted -- a permanent magnet cannot be turned off.

Practice — Electric Current and Its Effects

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