How many 60 W bulbs may be safely run on 220 v using a 5 A fuse?

Options

A. 18
B. 16
C. 14
D. 12

Answer

To solve the problem of how many 60 W bulbs can be safely run on a 220 V supply using a 5 A fuse, we can follow these steps:

### Step-by-Step Solution:

1. **Identify Given Values:**
- Power of a single bulb (P) = 60 W
- Voltage (V) = 220 V
- Maximum current (I) = 5 A

2. **Calculate Total Power Allowed by the Fuse:**
- The total power (P_total) that can be safely used with the fuse can be calculated using the formula:
\[ P_{\text{total}} = V \times I \]
- Substituting the given values:
\[ P_{\text{total}} = 220 \, \text{V} \times 5 \, \text{A} = 1100 \, \text{W} \]

3. **Determine the Number of Bulbs:**
- To find out how many bulbs can be connected, we divide the total power by the power of a single bulb:
\[ n = \frac{P_{\text{total}}}{P_{\text{single bulb}}} \]
- Substituting the values:
\[ n = \frac{1100 \, \text{W}}{60 \, \text{W}} \approx 18.33 \]

4. **Conclusion:**
- Since we cannot have a fraction of a bulb, we round down to the nearest whole number. Therefore, the maximum number of 60 W bulbs that can be safely run is:
\[ n = 18 \]

### Final Answer:
You can safely run **18 bulbs** of 60 W on a 220 V supply using a 5 A fuse.

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