(a) A wire of resistance R is cut into three equal parts. If these three parts are then joined in parallel,…
(a) A wire of resistance R is cut into three equal parts. If these three parts are then joined in parallel, calculate the total resistance of the combination so formed.
Solution
(a)
𝑅
Resistance of each part =
1 1
= + +
𝑅𝑝 𝑅1 𝑅2 𝑅3
1 1
= + +
𝑅𝑝 𝑅/3 𝑅/3 R/3
1 3 3
= + + =
𝑅𝑝 𝑅 𝑅 𝑅 𝑅
𝑅
Rp =
OR
(b)
• Electric power is the rate at which electrical energy is
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consumed or dissipated in an electrical circuit. / Electric
power is electrical energy consumed per unit time.
• When 1A current at 1V potential difference flows in a circuit.
/ Power consumed is 1W when 1J electrical energy is
consumed in 1 s.