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27/07/2021 12:36 pm
Topic starter
The electrical resistivities of four materials P, Q, R and S are given below :
P - 6.84 x 10-8 Ωm
Q - 1.70 x 10-8 Ωm
R - 1.0 x 1015 Ωm
S - 11.0 x 10-7 Ωm
Which material will you use for making :
(a) heating element of electric iron
(b) connecting wires of electric iron
(c) covering of connecting wires?
Give reason for your choice in each case.
1 Answer
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27/07/2021 12:37 pm
(a) S: because it has high resistivity of 11/10000000 ohm-m (it is actually nichrome).
(b) Q: because it has very low resistivity of 1.7/100000000 ohm-m (it is actually copper).
(c) R: because it has very very high resistivity of 1.0 x 100000000000000 ohm-m (it is actually rubber).