Current Electricity 5 Question 9
9. The supply voltage in a room is . The resistance of the lead wires is . A bulb is already switched on. What is the decrease of voltage across the bulb, when a heater is switched on in parallel to the bulb?
(2013 Main)
(a) zero
(b)
(c)
(d)
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Solution:
- As,
where,
So, from figure,