Today, I asked them a few questions to improve their conceptual understanding of electricity:
(1) What is the difference between e.m.f and potential difference?
(2) What is the difference between resistance and resistivity?
(3) How do you derive the unit for resistivity?
(4) Why does the resistance of a metallic conductor increase when its temperature increases?
(5) Why is the ammeter connected in series to a resistor but the voltmeter is connected in parallel?
Some points to note:
(1) Resistance is NOT the gradient of the V-I graph.
(2) The I-V and V-I graphs of a conductor may be different and you’ll need to understand why and explain the difference.
Rgds,
Ilyasa, M.Ed, PGDE, ex-MOE Math and Physics teacher (hp: 97860411)
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