Electric Current and its effects class 7 worksheet

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Electric Current and its effects class 7 worksheet

´╗┐Download electric current and its effects CBSE class 7 worksheets including questions based on latest syllabus including fill in the blanks, define, long questions and answers

Electric Current ( Points to Remember notes)

Many devices such as torches, transistors, toys, TV remote controls, use batteries. The wire gets hot when an electric current passes through it. This is the heating effect of the electric current.

an electric room heater or an electric heater used for cooking. All these contain a coil of wire. This coil of wire is called an element. You may have noticed that when these appliances are switched on after connecting to the electric supply, their elements become red hot and give out heat. The amount of heat produced in a wire depends on its material, length, and thickness. Thus, for different requirements, the wires of different materials and different lengths and thicknesses are used.

The amount of electricity held or carried by something is called an electrical charge. There are two types of electrical charges first is positive (+) and the second is negative (-). They are carried by electrons and protons. Electrons are said to carry a negative charge, while proton carries a positive charge. When there is a flow of electrical charges through a conductor, it is termed as Electric current. The SI Unit of current is Ampere.

Cell: A portable source of electricity which has two terminals, positive and negative

Electric circuit: An arrangement through which electric current flows in a conductor when it is connected to a source of electricity.

Electromagnet: A magnet consisting of a wire wound around a soft iron core in the form of a coil that acts as a magnet only when current flows through the wire.

Fuse: A safety device used for breaking the circuit during the overloading of current.

MCB or Miniature circuit break: It is a switch that automatically stops the current in a circuit if the current in it exceeds the specified maximum limit

Solenoid: A coil of wire closely wound in the form of a spiral

When current flows through a metallic wire, the wire offers some resistance to the flow of electrons. During this process, electrical energy converts into heat energy and this was first observed by JAMES PRESCOTT JOULE. Later this was called as the joule's law of heating effect.




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