A battery of e.m.f 3.0V is connected across a potentiometer wire AB of length 10Ωm‾¹ as illustrated in the diagram above. If the jockey J makes contact at the 30cm mark, determine the resistance of length AJ and voltage across AJ.
A. 3.0Ω; 0.9V B. 3.0Ω; 3.0V C. 3.3Ω; 0.3V D. 3.3Ω; 9.0V Correct Answer: Option A Explanation E = 3.0V; R/l=10Ωm‾¹ l = 30cm = 0.3m; R = 10Ωm‾¹ × 0.3m=3Ω E/V=l1/l2 ⟹ 3/V = 1/0.3 = 3×0.3/1 ...A lamp rated 100W, 240V is lit for 5hours. Calculate the cost of lighting the lamp if 1kWh of electrical energy cost N5.
A. N2.50 B. N3.20 C. N6.50 D. N9.60 Correct Answer: Option A A. N2.50 Explanation Power = 100W; Voltage = 240V; Time = 5 hours Total energy used = Power x time = 100 x 5 = 500wh converting to kwh, we have...A transformer connected to a 240Vr.m.s has 3000 turns in its primary coil and 500 turns in its secondary coil. Calculate the output voltage.
A. 4000V B. 400V C. 40V D. 4V Explanation Np=3000turns Ns=500turns Ep=240Vr.m.s Es=? Ns/Np=Es/Ep 500/3000=Es/240 ⟹Es=240×500/3000=40VThe diagrams above illustrate electrical connections to the element of an electric pressing iron. In which of the connections is the fuse correctly fixed?
A. I B. II C. III D. IV Correct Answer: Option B B. IIProducts
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