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The electric bulb, geyser, iron box, immersible water heater are based on this effect. The heating effect of electric current has many practical applications. An example of such a material is nichrome (an alloy of nickel, iron and chromium). In heating appliances, the heating element is made up of materials with high melting point. When an electric current passes through a wire, the electrical energy is converted to heat. This causes the diaphragm in the earpiece to vibrate, producing sound.Įxplain the heating effect of electric current As the person on the other end of the line speaks, his voice cause the current in the circuit to change. The diaphragm becomes attracted to the electromagnet. When a current flows through the wires, the soft – iron bar becomes an electromagnet. The diaphragm is attached to spring that is fixed to the earpiece. The diaphragm is made up a metal that can be attracted to magnets. In telephones, a changing magnetic effect causes a thin sheet of metal (diaphragm) to vibrate. Current remains same in all parts of the circuit.Įlectrical conductivity or specific conductance is the measure of a material’s ability to conduct an electric current.Įxplain flie construction and working of an Telephone. Voltage remains the same across each component of the circuit. #Remoter start milli amp draw serial
The conventional symbol for current is I.ĭifferentiate parallel and serial circuits. Name some devices that run using heat effect of electric currentīatteries are a collection of one or more cells whose chemical reactions create a flow of electrons in a circuit.Īn electric current is measured by the amount of electric charge moving per unit time at any point in the circuit. Name the device used to generate electricity.Įlectric fuse is a safety device which is used in household wiring and in many appliances. The SI unit of electrical conductivity is Siemens / metres (s/m).
What is the S.I unit of electrical conductivity? If both A and R are true and the R is correct explanation of AĬurrent travels at the speed of 1/100th times the speed of light 0.0002 m/s. If both A and R are true but R is not a correct explanation of A.Ī. If both A and R are true and the R is correct explanation of A.ī.
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Reason (R) : They have no free charge carriers.Ī. Both A and R are true and R is the correct explanation of AĪssertion (A) : Insulators do not allow the flow of current through themselves. Both A and R are true but R is NOT the correct explanation of A.Ī. Both A and R are true and R is the correct explanation of A.ī. Reason (R) : Copper has very low electrical resistance.Ī. Milli ampere: micro ampere : : 10 – 3A: _.Īssertion (A) : Copper1 is used to make electric wires.
Fuse – safety device used in electric circuit. Miniature circuit Breaker – Reset by hand, circuit becomes complete once again. Switch – used to open or close a circuit. Cell – A device which converts chemical energy into electrical energy. Fuse – A device which converts chemical energy into electrical energy. Miniature circuit Breaker- Reset by hand, circuit becomes complete once again. Circuit – A complete path for the flow of an electric current. Switch – safety device used in electric circuit. The electrical conductivity of the semiconductor is in between a conductor and an insulator. The representation of the electric current is A.įalse.The representation of the electric current is I. In a parallel circuit, the electric components are divided into branches. The fuse wire melts whenever there is overload in the wiring. The fuse wire does not melts whenever there is overload in the wiring. 
True or false – If false give Hie correct answer:Įlectron flow is in the same direction to conventional current flow.Įlectron flow is in the opposite direction to conventional current flow. unit of Electrical conductivity of a conductor is _
In conducting materials electrons are _. _ is used to measure the electric current. One unit of coulomb is charge of approximately _ protons or electrons. The direction of conventional current is _ to electron flow. Which of the following circuits are the bulb connected in series? How many milliampere are there in 0.25 A ? Small amounts of electrical current are measured in milliampere (mA). In the circuit shown, which switches (L, M or N) must be closed to light up the In the circuit diagram below, 10 units of electric charge move past point x every second What is the current in the circuit _. Tamilnadu Samacheer Kalvi 7th Science Solutions Term 2 Chapter 2 Electricity Samacheer Kalvi 7th Science Electricity Textual Evaluation 
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You can Download Samacheer Kalvi 7th Science Book Solutions Guide Pdf, Tamilnadu State Board help you to revise the complete Syllabus and score more marks in your examinations.
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