The electrical resistivity of three materials A, B and C at 20°C is given below : Material | Resistivity (Ω…
The electrical resistivity of three materials A, B and C at 20°C is given below :
Material | Resistivity (Ω m)
A | 1017
B | 44 × 10−6
C | 1.62 × 10−8
(i) Classify these materials as conductor, alloy and insulator.
(ii) Give one example of each of these materials and state one use of each material in the design of an electrical appliance say an electric stove or an electric iron.
Solution
(i)
A - Insulator
B - Alloy
C - Conductor
(ii)
A: Plastic - handle of an electric iron.
B: Nichrome – used as a heating element in an electric iron.
C: Copper - electric wires.
A: Rubber– foot of the electric stove.
B: Nichrome – used as a heating element in an electric stove.
C: Copper- electric wires.
(any other example with its use in an electric appliance)