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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