Electrical Installation Calculations: Advanced by Kitcher Christopher

Author:Kitcher, Christopher
Language: eng
Format: epub
Publisher: Taylor and Francis

Current

0–1A

0–10A

6 A moving-coil instrument requires 0.75mA of current to produce f.s.d. at a voltage of 50mV. The resistance of the coil is

(a) 0.015 Ω

(b) 0.067Ω

(c) 66.7Ω

(d) 0.0518V

7 The coil of a moving-coil instrument has resistance 45Ω and requires a current of 1.15mA to produce f.s.d. The p.d. required to produce f.s.d. is

(a) 51.8V

(b) 39V

(c) 0.025V

(d) 51.8V

8 The value of the multiplier required to convert the instrument of Question 7 to a voltmeter to measure up to 250V is approximately

(a) 217kΩ

(b) 6.25Ω

(c) 217Ω

(d) 288 kΩ

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