alleryThree resistors of 2 ohm, 3 ohm and 5 ohm are joined in series. What is their effective resistance?
A0.97 ohm
B3.33 ohm
C30.0 ohm
D10.0 ohm
Answer & Solution
Correct answer: D. 10.0 ohm
1. For series, resistances simply add: $R_s = R_1 + R_2 + R_3$.
2. $R_s = 2 + 3 + 5 = 10\,\Omega$.
3. The value 0.97 would be the parallel result, which is not asked here.
4. Series resistance is always larger than the largest single resistor.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 4 Electricity "Electricity", p.62_
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