We know that an electric bell works with the help of an electromagnet. Can we use a bar magnet in an electric bell instead of an electromagnet? Explain.
Important Questions on Electric Current and Its Effects
You must have watched birds sitting on the naked high tension wire. Why do they not get electric shock?
Dinesh wanted to buy and electric bell for his front door. He asked his friends for their opinions. Some suggested electric doorbell whereas a majority of the other suggested battery operated doorbell. Can you guess the reason why majority of his friends suggested battery operated doorbells?
Study this electrical circuit. It consists of a powerful battery, a bulb, an electromagnet and a movable connection. The connection is designed in such a way that it closes (that is, it allows electric current to pass) when the electromagnet is not magnetised; but opens when the electromagnet is magnetised. If the electromagnet takes 5 seconds to get magnetised, what will be status of the electric bulb?
See the circuit shown below in figure P. If the battery is connected the other way (as shown in figure Q), what will happen?
The diagram shows a flashlight battery and a bulb connected by wires to various substances. Which of the bulbs will light?
Many electrical devices like televisions and electric irons have plugs which have 3 pins. However, other devices sometimes work with only 2 pins. Why is the third pin necessary?
When connected as shown, the bulb glows, but dimly. Which of these CAN be the explanation for this:
