A power supply, three resistors and a component $$\(X\)$$ are connected in the circuit shown in Fig. 5.1. Fig. 5.1 The power supply has an electromotive force (e.m.f.) of 230 V and negligible internal resistance. The current in the power supply is 7.0 A . (i) Identify component X . ................................................................................................................................. (ii) Show that the p.d. across the resistor of resistance $$\(0.86 \Omega\)$$ is 6.0 V . (iii) Determine the current $$\(I_{1}\)$$. $$\[ I_{1}= \]$$ ................................................... A (iv) Calculate the p.d. across component X . $$\[ \text { p.d. }= \]$$ .................................................. V (v) Calculate the power dissipated in component X . power = ................................................. W (vi) The purpose of the circuit is to provide power to component X . Determine the percentage efficiency of the circuit. efficiency $$\(=\)$$ .................................................. \% (vii) The resistor of resistance $$\(170 \Omega\)$$ is removed, leaving an open circuit in the lower branch of the circuit. There is no change to the resistance of component X . State whether the current in the power supply increases, decreases or remains the same. .................................................................................................................................
Exam No：9702_w24_qp_22 Year：2024 Question No：5(b)
Answer:
Knowledge points:
10.1.1 recall and use appropriate circuit symbols as set out in the ASE publication Signs, Symbols and Systematics (example circuit symbols are given in Section 5.5.)
10.1.2 draw and interpret circuit diagrams containing sources, switches, resistors, ammeters, voltmeters, and/or any other type of component referred to in the syllabus
10.1.3 define electromotive force (e.m.f.) in terms of the energy transferred by a source in driving unit charge round a complete circuit
10.1.4 distinguish between e.m.f. and potential difference (p.d.) in terms of energy considerations
10.1.5 understand the effects of the internal resistance of a source of e.m.f. on the terminal potential difference
9.2.1 define potential difference and the volt
9.2.2 recall and use
9.2.3 recall and use P = VI and P = I2R
Solution:
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