By B. L. Theraja
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Extra info for A Textbook of Electrical Technology in SI Units. Volume I: Basic Electrical Engineering
A) powers are additive (b) voltages are additive (c) currents are additive (d) elements have individual currents 12. The positive terminal of a 6-V battery is connected to the negative terminal of a l2-V battery whose positive terminal is grounded. The potential at the negative terminal of the 6-V battery is-volt. f2V -Fig. 102 17. In Fig. 103, there is a drop of 20 V on each resistor. The potential of point A would be volt. (a) (b) (c) (d) + 80 - 40 + 40 - 80 Electric Cu"ent and Ohm's Law A 47 B 20.
56, voltmeter has been joined across the 4 ill resistor. The equivalent resistance between B and C =4 x 12116= 3 ill Drop across B and C = 100 x 3/(3 +' I) = 75 V. (c) Resistance between A and C =3 + I =4 ill = 100/4 = 25 mA .. increase in current =25 - 20 =5 mA New supply current 100 V, Fig. 56 . 250l-/0 (d) Percentage error m voItage = 80 true voItage The reduction in the value of voltage being measured in called voltmeter loading effect because voltmeter loads down the circuit element across which it is connected.
5 A each. 42 Electrical Technology Obviously, voltage V represents the potential of point B with respect to the negative terminal of the battery. Point B is above the ground by an amount equal to the voltage drop across the series combination of (40 + 50) = 90n. 5 x 90 = 45 V. +IOOV IA IA A A . r-iB 40 100 100 oov 100 100V 100 C I C to I 50 AAA c (b) -=- (a) (c) (d) Fig. 29. Voltage Divider Circuit A voltage divider circuit (also called potential divider) is a series network which is used to feed other networks with a number of different voltages and derived from a single input voltage source.
A Textbook of Electrical Technology in SI Units. Volume I: Basic Electrical Engineering by B. L. Theraja