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1
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What is the difference between Ohmic and Non-Ohmic resistors? Explain along with their examples.
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2
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Differentiate between the Resistance (V-I) graph and the Conductance (I-V) graph.
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3
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What is the impact of the increase in temperature on the specific resistance of:
a) Metals
b Semi-conductors
c) Alloys
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4
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Give reasons:
a) The wires used for electrical connections and power transmission are made of copper or aluminium.
b The resistance wires (standard resistors) are made from alloys such as Manganin & Constantan c) A fuse wire is made from an alloy of Lead and Tin
d) The filament of Electric Bulb is made of Tungsten
e) The heating element in appliances such as Heaters, Toaster, Oven is made up of Nichrome
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5
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What do you mean by Super Conductors? Give examples.
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6
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What do you mean by Electro-Motive Force? Give its formula.
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7
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Differentiate between E.m.f, Terminal Voltage and Voltage Drop of a cell.
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8
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How to calculate the equivalent resistance of different combinations?
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9
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Derivations of R = R1 + R2... and 1/R = 1/1 + 1/R2...
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10
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What do you mean by Internal Resistance of a cell (Resistance by electrolyte)? Mention all the factors affecting it
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11
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Numerical sums based on different circuit diagrams
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12
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What do you mean by the heating effect of electric current (Joule's law of heating)? Mention the factors affecting it. H = 12 Rt
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13
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What is the meaning of Power rating of an Electrical Appliance (an electric bulb rated
100 W 220 V)?
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14
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Numerical sums based on Electrical Energy supplied by the source and Electrical Power.
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15
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What is the relation between Joule and Kilowatt Hour and define them)?
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16
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Define current and state its SI unit.
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17
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Write factors affecting the internal resistance of a cell.
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18
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Calculate the total resistance across AB. If a cell of emf 2.4 V with negligible internal resistance is connected across AB, calculate the current drawn from the cell.
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19
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What is meant by electric current?
- Name and define its Sl unit.
- In a conductor electrons are flowing from B to A. What is the direction of conventional current? Give justification for your answer.
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20
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Two resistors of 4 2 and 6 2 are connected in parallel to a cell to draw 0.5 A the cell.
- Draw a labelled circuit diagram showing the given arrangement.
- Calculate the current in each resistor
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21
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Two copper wires A and B are of the same thickness and are at room temperature. If the length of A is twice the length of B then:
- Compare their resistances
- Compare their resistivities.
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22
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You have three resistors of values 2 ohm, 3 ohm and 5. How will you join them so that the total resistance is more than 7 ohms?
- Draw a diagram for the arrangement.
- Calculate the equivalent resistance.
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23
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The voltage-current readings of a certain material are shown in the table given below:
Study the table.
State whether the conductor used is ohmic or non-ohMIC
(B) Justify your answer.
(C) State Ohm's law.
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24
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(A) Define specific resistance.
(B) What happens to the specific resistance of a conductor if its length is doubled?
(C) Name a substance whose specific resistance remains almost unchanged with the increase in its temperature.
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25
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A battery of emf i2 V and internal resistance 2 ® is connected to two resistors of resistances 3 and 72 in series. Find the current through the battery:
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26
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A music system draws a current of 400 mA when connected to a 12 V battery.
- What is the resistance of the music system?
- The music system is left playing for several hours and finally the battery voltage drops and the music system stops playing when the current drops to 320 mA. At what battery voltage does the music system stop playing?
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27
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State Ohm's Law and explain its limitations.
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28
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Explain the heating effect of electric current with examples.
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29
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Explain the concept of electrical resistance. What are the factors that affect the resistance of a conductor?
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30
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What is the difference between electrical power and electrical energy?
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