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donuteatingcat
27.01.2020 •
Physics
Aresistor of 5 ω is placed in a circuit. the voltage drop across the resistor is 12 v. what is the current through the resistor?
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Ответ:
R = 5 Ω
U = 12 V
i = ?
Formula:
Solving:
The current through the resistor is 2.4 Amperes
Ответ:
6 bulbs are needed to illuminate the room.
Explanation:
Given:
Measurement of kitchen (A) = 10 ft by 10 ft = 100 sq. ft
Number of footcandles (n) = 50
Lumens emitted by 1 bulb = 834
Number of bulbs (N) = ?
We are also given,
1 foot candle = 1 lumen/sq. ft
So, 50 foot candles = 50 lumens/sq. ft
Now, for an area of 1 sq. ft 50 lumens are emitted.
So, for an area of 100 sq. ft, lumens emitted = 50 × 100 = 5000 lumens
Now, one bulb emits = 834 lumes
Therefore, number of bulbs required for emitting 5000 lumens is given as:
So, 6 bulbs are needed to illuminate the room.