An electriv bulb has a power of 500 W. Express it in CGS units.

Answer

To convert the power of an electric bulb from watts to CGS units, follow these steps:

1. **Identify the given power in SI units:**
\[ P = 500 \text{ W} \]
In SI units, power is measured in watts (W), where \(1 \text{ W} = 1 \text{ J/s}\).

2. **Understand the CGS unit for power:**
In the CGS (centimeter-gram-second) system, power is measured in ergs per second (erg/s), where \(1 \text{ erg} = 10^{-7} \text{ J}\).

3. **Convert the given power from watts to ergs per second:**
Since \(1 \text{ W} = 1 \text{ J/s}\) and \(1 \text{ J} = 10^7 \text{ erg}\),
\[ 1 \text{ W} = 10^7 \text{ erg/s} \]

4. **Calculate the power in CGS units:**
\[ P = 500 \text{ W} \times 10^7 \text{ erg/s per W} \]
\[ P = 500 \times 10^7 \text{ erg/s} \]
\[ P = 5 \times 10^9 \text{ erg/s} \]

Therefore, the power of the electric bulb in CGS units is \(5 \times 10^9 \text{ erg/s}\).