a copper wire has diameter 0.5mm and resistivity of 1.6x10 to the power -8 . what will be the length of this wire to make its resistance 10 ohm's
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Unlike charges _______each other. Like charges______each other.
Those substances through which electricity is passed are called.
Those substances through which electricity can not flow are called
Define the term Potential difference? What is its SI unit?
Define one Volt.
Name the instrument which is used to measure Potential difference.
Define the term Electric current? What is its unit?
Name the instrument which is used to measure Electric current.
Draw the symbols of Electrical symbols-
a) Cell b) Battery c) Connecting wire d) Fixed resistance e) Variable resistance f) Ammeter g) Voltmeter h) Galvanometer i) Cross wire j) Close switch k) Open switch l) Electric bulb
Define Ohm’s law. Plot V-I graph.
Define Resistance of a conductor. What is its SI unit?
If the resistance is doubled the current gets______ if the resistance is halved the current gets____
What are the factors affecting the resistance.
Define the term resistivity. Write its unit also.
Long wire has ______ resistance, short wire has______ resistance.
If the area of cross section is halved, then resistance will be ________
Resistance of wire _____ with increases in temp and resistance decreases with _______decrease in temperature.
What are the disadvantages of series circuit for Domestic wiring?
What are the advantages of parallel circuit for Domestic wiring?
Define the term Electric Power. And define one watt.
What is the relation in terms of between a) V-I b) I &R c) V and R
What is the commercial unit of power?
Define Electric energy. Write its formula also.
Describe the Relation between Kilowatt-hour and joule.
Heat produced is directly produced to _________
Wire few applications of the heating effect of current.
Explain why? Tungsten is used for making the filaments of electric bulbs.
State and explain Joule’s Law of heating.
Why does cord of electric heater not glow while the heating element does?
Calculate the number of electrons constituting one coulomb of charge.
How much energy is given to each coulomb of charge passing through a 6v battery?
An electric bulb draws a current of 0.25 A for 20 minutes. Calculate the amount of electric charge that flows through the circuit.Potential difference between these points.
A copper wire has a diameter of 0.5 mm and resistivity of 1.6x10-6 Ωm
i) What will be the length of this wire to make its 10?
ii) How much does the resistance change if the diameter is double?
A resistance wire is doubled up by folding. Calculate the new resistance of the new resistance of the wire.
a) Draw the diagram of a circuit consisting of a battery of three cells of 2V each, a 5Ω resistor an 8Ω resistor And 12Ω resistor, and a plug key, all connected in series.
b) Redraw the above circuit putting an ammeter to measure the current through the resistor and a voltmeter to Measure the Potential difference across the 12Ω resistor. What would be the Readings in the ammeter and Voltmeter
An electric bulb is rated 220V and 100V. When it is operated on 110V, the power consumed will be
a) 100w b) 75w c) 50w d) 25w
Calculate the energy transferred by a 5A current flowing through a resistor of 2Ω for 30minutes. An electric heater
Draws a current of 10A form a 220V supply. What is cost of using the heater for 5 hrs everyday for 30 days if the Cost of 1 unit (1Kwh) is Rs. 5.20.
Calculate the heat produced when 96000 coulombs of charge is transferred in 1 hr through a Potential difference of 50V.
Two resistances wire of same material and of equal diameter are first connected in series and then parallel in an electric circuit. The ratio of produced in a series and parallel combination would be: a) 1:2 b) 2:1 c) 1:4 d) 4:1