Q15. A transformer has an efficiency of 80%. It works at 3 kW and 120 V. If the secondary voltage is

Q: What is the correct answer for CUET UG Physics Q15?

The correct answer is d. The efficiency (η) of a transformer is defined as the ratio of output power (P_out) to input power (P_in): η = P_out / P_in. We are given the efficiency η = 80% = 0.8. The input power (P_in) is 3 kW = 3000 W. We can calculate the output power: P_out = η * P_in = 0.8 * 3000 W = 2400 W. The secondary voltage (V_s) is given as 240 V. The output power is also related to the secondary voltage and secon

Q: Q15. A transformer has an efficiency of 80%. It works at 3 kW and 120 V. If the secondary voltage is 240 V, what will be the secondary current? (a) 2.5 A (b) 12.5 A (c) 25 A (d) 10 A

The correct answer is d. The efficiency (η) of a transformer is defined as the ratio of output power (P_out) to input power (P_in): η = P_out / P_in. We are given the efficiency η = 80% = 0.8. The input power (P_in) is 3 kW = 3000 W. We can calculate the output power: P_out = η * P_in = 0.8 * 3000 W = 2400 W. The secondary voltage (V_s) is given as 240 V. The output power is also related to the secondary voltage and secon

Q: What are the options for this CUET UG Physics question?

A. 2.5 A · B. 12.5 A · C. 25 A · D. 10 A

Question

Q15. A transformer has an efficiency of 80%. It works at 3 kW and 120 V. If the secondary voltage is 240 V, what will be the secondary current?
(a) 2.5 A
(b) 12.5 A
(c) 25 A
(d) 10 A

FirstInTest · Accepted Answer

The efficiency (η) of a transformer is defined as the ratio of output power (P_out) to input power (P_in): η = P_out / P_in. We are given the efficiency η = 80% = 0.8. The input power (P_in) is 3 kW = 3000 W. We can calculate the output power: P_out = η * P_in = 0.8 * 3000 W = 2400 W. The secondary voltage (V_s) is given as 240 V. The output power is also related to the secondary voltage and secondary current (I_s) by P_out = V_s * I_s. Therefore, the secondary current can be calculated as I_s = P_out / V_s = 2400 W / 240 V = 10 A. Options (a), (b), and (c) are incorrect as they do not match the calculated secondary current.

Answer

2.5 A

Answer

12.5 A

Answer

25 A

Answer

10 A

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