Ram has LED of resistance $10 Ω$ which will only light up if the current provided is $1 A$ . Below $1 A$ current it won't light up, above that the LED will burst. He also has 10 two volt cells. Find out how many cells will Ram need to light up the LED?

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Solution

The correct option is C
5

Given, resistance, $R = 10 Ω$ ,
current, $I = 1 A$
Required voltage, $V = I \times R = 1 \times 10 = 10 V$
Hence, 5 two volt batteries are required.

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Ram has LED of resistance 10 Ω which will only light up if the current provided is 1 A. Below 1 A current it won't light up, above that the LED will burst. He also has 10 two volt cells. Find out how many cells will Ram need to light up the LED?

The correct option is C 5 Given, resistance, R=10 Ω , current, I=1 A Required voltage, V=I×R=1×10=10 V Hence, 5 two volt batteries are required.

Ram has LED of resistance $10 Ω$ which will only light up if the current provided is $1 A$ . Below $1 A$ current it won't light up, above that the LED will burst. He also has 10 two volt cells. Find out how many cells will Ram need to light up the LED?

The correct option is C
5

Given, resistance, $R = 10 Ω$ ,
current, $I = 1 A$
Required voltage, $V = I \times R = 1 \times 10 = 10 V$
Hence, 5 two volt batteries are required.