2. LA milli-ammeter of 2.5 ohms resistance reads up-to 100 mA. Calculate the resistance which is necessary to enable it

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2 La Milli Ammeter Of 2 5 Ohms Resistance Reads Up To 100 Ma Calculate The Resistance Which Is Necessary To Enable It 1 (29.05 KiB) Viewed 52 times

2. LA milli-ammeter of 2.5 ohms resistance reads up-to 100 mA. Calculate the resistance which is necessary to enable it to use as a) A voltmeter reading up-to 10 V b) An ammeter reading up-to 10A (10 Marks) 21 Page PL/EX/02 ii. Figure 3 shows a simple series circuit of R₁ and R: connected to a 100 V de source. If the voltage across R: is to be measured by voltmeter having (a) A sensitivity of 1000 G/V. (b) A sensitivity of 20,000 £2/V, Find which voltmeter will read the accurate value of voltage across R Assume that both meters are used in the 50 V range. 10k Figure 3 (10 Marks) ii. An LVDT has a secondary voltage of 5 V for a displacement of 12.5 mm. Determine the output voltage for a core displacement of 8.0 mm from its central position. (5 Marks) iv. Photoconductive cells are used to control relays. The cells' resistance is 100 k 12 when illuminated and 1 k 12 when they are in the dark. When the cell is illuminated, the relay is supplied with 10 mA from a 30-V supply, and it must be de-energized when the cell is in the dark. The circuit is as shown in Fig. 4, where R is a current-limiting resistor and calculate the series resistance and dark current. (Neglect relay inductance) Figure 4 100 V 9 in un REV00/00000000