The rating 150W, 240V on an electric bulb means:

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11. The rating 150W, 240V on an electric bulb means: 150W indicates that the bulb consumes 150 Joules of electrical energy per second and converts it into light and heat when operating at its rated voltage. 240V indicates that the bulb is designed to operate optimally and safely when connected to a 240 Volt power supply. 12. When the switch is closed, current flows through the coil, turning it into an electromagnet. The soft iron rods inside the coil become magnetized by induction. This happens because soft iron is a ferromagnetic material that is easily magnetized when placed within the magnetic field produced by the current-carrying coil. 13. Ultrasonic sound is preferred for echo sounding to determine ocean depth for two main reasons: Ultrasonic waves have a high frequency and short wavelength, which means they experience less diffraction and can be transmitted in a narrow, highly directional beam. This allows for better accuracy and resolution in detecting the ocean floor. They are less attenuated (absorbed) by water over long distances compared to audible sound, allowing them to travel further into the ocean and reflect effectively from the seabed.

The rating 150W, 240V on an electric bulb means:

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