ETO ETO Exam papers 📅 Dec 2024

Exam Question

(a) Which has the greater equivalent resistance; two equal capacitors in series or in parallel? Explain with reasons? (6)

(b) A circuit has a resistance of 3Ω and an inductance of 0.01H. The voltage across its ends is 60V and the frequency is 50Hz. Calculate (10)

(a) The impedance

(b) The power factor

Reference Answer

(a) In series combination, charge on all capacitors is the same but p.d. across each is different.
$$V = V1 + V2 + V3$$
or $${Q\over{C}} = {Q\over{C1}} + {Q\over{C2}} + {Q\over{C3}}$$
or $${1\over{C}} = {Q\over{C1}} + {Q\over{C2}} + {Q\over{C3}}$$

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