A voltage of 15 volt is applied across a colour coded carbon resistor with first, second and third rings of brown, green and black colours. What is the current flowing through the resistor?

एक रंगीन कार्बन प्रतिरोधक पर 15 वोल्ट वोल्टेज लगाया जाता है जिसकी पहली, दूसरी और तीसरी पट्टियाँ क्रमशः भूरा, हरा और काला रंग हैं। प्रतिरोधक से होकर बहने वाली धारा क्या होगी?

The resistor has three colour bands: brown, green, black. Using the standard resistor colour code:

• 1st band (brown) = first digit = 1
• 2nd band (green) = second digit = 5
• 3rd band (black) = multiplier = 10⁰ = 1

Combine the first two digits to form the base number: 15. Multiply by the multiplier: 15 × 1 = 15 Ω. So the resistor value is 15 ohms.

When a voltage V = 15 V is applied across a resistance R = 15 Ω, use Ohm’s law: V = I × R. Rearranging gives current I = V / R. Substituting the values: I = 15 V / 15 Ω = 1 A.

Therefore the current flowing through the resistor is 1 ampere (1 A). Note: With a three-band colour code the third band is the multiplier. Tolerance band (if present) is a fourth band and has not been specified here.