Fill in the blank with the most appropriate option.

18 volts = _________ × 3 ohms.

This question was previously asked in
RRB ALP Previous Paper 9 (Held On: 14 Aug 2018 Shift 2)
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  1. 6 watts

  2. 6 amperes

  3. 6 milliamperes

  4. 6 joules

Answer (Detailed Solution Below)

Option 2 :

6 amperes

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Detailed Solution

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CONCEPT:

  • Ohm’s law: At constant temperature, the potential difference across a current-carrying wire is directly proportional to the current flowing through it.

          i.e. V = IR

Where V = potential difference, R = resistance and I = current.

CALCULATION:

Given V = 18 V and R = 3 Ω,

  • According to ohm's law:

⇒ ​V = IR

⇒ I = V/R

⇒ I = 18/3 = 6 A

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