Question

An electric bulb is connected to a 220 V generator. The current is 0.50 A. What is the power of bulb ?

• A. \(110 \text{ watt}\)
• B. \(100 \text{ watt}\)
• C. \(220 \text{ watt}\)
• D. \(55 \text{ watt}\)

Hint:

The key formula for power is \(P = VI\). Just multiply the voltage by the current: \(220 \times 0.50 = 110\). Remember that \(0.50\) is half, so you're finding half of \(220\).

Answer 1

The Correct Option is A

Concept: Electric power (\(P\)) is the rate at which electrical energy is consumed or produced. It's related to voltage (\(V\)) and current (\(I\)). Step 1: Given information
Voltage (\(V\)) = \(220 \text{ V}\)
Current (\(I\)) = \(0.50 \text{ A}\) Step 2: Formula for Electric Power The formula to calculate electric power when voltage and current are known is: \[ P = V \times I \] Where \(P\) is in watts (W), \(V\) in volts (V), and \(I\) in amperes (A). Step 3: Calculate the power Substitute the given values into the formula: \[ P = 220 \text{ V} \times 0.50 \text{ A} \] \[ P = 110 \text{ W} \] (Note: Multiplying by 0.50 is the same as dividing by 2). The power of the bulb is \(110 \text{ watts}\). This matches option (1).