LMS Substation 1st Year, Level II 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

A lamp operates on 300 volts and draws 25 milliamps. What is the resistance of this lamp?

12000 Ω

To find the resistance of the lamp, you can use Ohm's Law, which states that Voltage (V) equals Current (I) multiplied by Resistance (R). This can be rearranged to calculate resistance as R = V / I.

In this case, the lamp operates at 300 volts, and it draws a current of 25 milliamps. It's important to convert milliamps to amps for this calculation. Since 1 milliamp is equal to 0.001 amps, 25 milliamps is equal to 0.025 amps.

Using the data:

- Voltage (V) = 300 volts

- Current (I) = 0.025 amps

Now, substituting into the formula:

R = V / I

R = 300 volts / 0.025 amps

R = 12000 ohms

Thus, the resistance of the lamp is 12000 ohms, which aligns with the correct answer. The calculations confirm that the lamp's ability to draw a specific amount of current at a set voltage results in this resistance value.

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5000 Ω

6000 Ω

3000 Ω

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