Which one has more resistance 100 watt bulb or 60 watt bulb both operating at 220V?
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A lot of 20 bulbs contain 4 defective ones. One bulb is drawn at random from the lot. What is the probability that this bulb is defective?
(i) Total numbers of bulbs = 20 Numbers of defective bulbs = 4 Probability of getting a defective bulb = 4/20 = 1/5 (ii) One non defective bulb is drawn in (i) then...
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Out of two electric bulbs of 50W - 220V and 100W - 220V.
The resistance of the bulb is defined as R =V2/P So the resistance of 50W bulb is double than the resistance of 100W bulb. When they are connected in series...
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In an electric bulb, light is produced due to the glowing of (a) the glass case of the bulb.
(b) the thin filament.
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When a (60W, 220V) bulb and a (100 W, 220 V) bulb are connected in series,
The resistance of the bulb is given by R=(V2/P). So, the resistance of 60 W bulb is more than the resistance of 100 W bulb. When they are connected in...
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When a (60W, 220V) bulb and a (100 W, 220 V) bulb are connected in series, then which bulb will glow brighter?
The resistance of the bulb is given by R =v2/ P. So, the resistance of 60 W bulb is more than the resistance of 100 W bulb. When they are connected...
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The peak voltage in a 220V AC source is (a) 220V
(c) about 310V
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An AC source is rated 220V, 50Hz. The average voltage is calculated in a time interval of 0.01s.
(b) may be zero
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Let nr and nb be respectively the number of photons emitted by a red bulb and a blue bulb of equal power in a given time.
(c) Red bulb and a blue bulb of equal power in a given time nr > nb.
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A 25 watt bulb emits monochromatic light of wave length 0.75 x10^-6 meter . calculate rate of emission of quanta per sec
W= pxt W=25 x 1 J n = w/hc/ ʎ =25x 0.75 x10-6 /6.626x 10-34x 3x 108 =7.18 x 1019
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A servo voltage stabiliser restricts the voltage output to 220V ± 1%. If an electric bulb rated at 220V,
Output voltage = 220 ± 1% 1% of 220V = 2.2v The resistance of bulb R = V2/P = (220)2/100 = 484Ω (a) For minimum power consumed V1 = 220 – 1% =...
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