A cell of emf 2 V has an internal resistance of 0.5 Ω. A current of 0.4 A passes through an external resistor, P. Determine the resistance of P.
The diagram above illustrates a hot metal suspended at the centre of a closed uniform box. Thermometers E, F, G and H are placed in contact with four sides of the box. Which of the thermometers would register the highest temperature?
A direct current cannot pass through a parallel plate capacitor because
The sagging of overhead electrical wires is caused by
The property of a body that determines the direction of heat flow when the body is in contact with another body is the
