Watt's law: Variable resistor, glow coil, volt and amp meter.
5F15.16 • D+55+2
Watt's law: Variable resistor, glow coil, volt and amp meter. The electric heating element (glow coil) in this demo has a resistance of about 19 ohms. When the knife-switch is closed, a current flows through the coil, causing the coil to heat up. Watt's law states that the rate of energy transfer P equals the current times the voltage.
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