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Do you want 100% Marks with less
effort Prepare the Following YSA Paper for YOU.?
Class – X
Subject – Science
NUMERICALS ON ELECTRICITY
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The current passing through a room
heater has been halved. What will happen to the heat
produced by it?
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An electric iron of resistance 20
ohm draws a current of 5 amperes. Calculate the heat
produced in 30 seconds.
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An electric heater of resistance 8
ohm takes a current of 15 A from the mains supply line.
Calculate the rate at which heat is developed in the
heater.
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A resistance of 40 ohms and one of
60 ohms are arranged in series across 220 volt supply.
Find the heat in joules produced by this combination in
half a minute.
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A resistance of 25 ohm is connected
to a 12 V battery. Calculate the heat energy in joules
generated per minute.
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100 joules of heat is produced per
second in a 4 ohm resistor. What is the potential
difference across the resistor?
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An electric iron is connected to the
mains power supply of 220 V. When the electric iron is
adjusted at minimum heating’ it consumes a power of
360 W but at ‘maximum heating’ it takes a power of
840 W. Calculate the current and resistance in each
case.
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Ten bulbs are connected in a series
circuit to a power supply line. Ten identical bulbs are
connected in a parallel circuit to an identical power
supply line.
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Which circuit would have the highest
voltage across each bulb
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In which circuit would the bulbs be
brighter?
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In which circuit, if one bulb blows
out, all others will stop glowing?
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Which circuit would have less
current in it?
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Calculate the cost of operating a
heater of 500 W for 20 hours at the rate of Rs. 3.90 per
unit.
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Which has a greater resistance, a
100 watt bulb or a 60 watt bulb?
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How much energy is consumed when a
current of 5 amperes flows through the filament (or
element) of a heater having resistance of 100 ohms for
two hours? Express it in joules.
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An electric bulb is rated at 220 V,
100 W. What is its resistance?
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An electric bulb is connected to a
220 V power supply line. If the bulb draws a current of
0.5 A, calculate the power of the bulb.
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In which of the following cases more
electrical energy is consumed per hour?
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A current of 1 ampere passed through
a resistance of 300 ohms
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A current of 2 amperes passed
through a resistance of 100 ohms.
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Electric kettle rated at 220 V, 2.2
kW, works for 3 hours. Find he energy consumed and the
current drawn. W
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In a house two 60 W electric bulbs
are lighted for 4 hours, and three 100 W bulbs for 5
hours everyday. Calculate the electric energy consumed
in 30 days.
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If the potential difference between
the ends of a wire of fixed resistance is doubled, by
how much does the electric power increase?
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A bulb is rated as 250 V; 0.4 A.
Find its : (i) power, and (ii) resistance.
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For a heater rated at 4 kW and 220
V, calculate (a) the current, b) the resistance of the
heater, ) the energy consumed in 2 hours, and d) the
cost if 1 kWh is priced at Rs. 4.60.
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An electric motor takes 5 amperes
current from a 220 volt supply line. Calculate the power
of the motor arid electrical energy consumed by it in 2
hours.
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Which uses more energy: a 250 W TV
set in 1 hour or a 1200 W Toaster in 10 minutes?
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An electric bulb is rated as 10 W,
220 V. How many of these bulbs can be connected in
parallel across the two wires of 220 V supply line if
the maximum current which can be drawn is 5 A.
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How much work is done in moving a
charge of 2 coulombs from a point at 118 volts to a
point at 128 volts?
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What possible values of resultant
resistance one can get by combining two resistances, one
of value 2 ohm and the other 6 ohm?
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If 3 resistances of 3 ohm each are
connected in parallel, what will be their total
resistance?
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Three resistors are connected as
shown in the diagram. Through the resistor 5 ohm, a
current of 1 ampere is flowing.
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What is the current through the
other two resistors?
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What is the p.d. across AB?
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What is the total resistance?
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Two resistances are connected in
series as shown in the diagram:
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What is the current through the 5
ohm resistance?
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What is the current through R?
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What is the value of R?
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What is the value of V?
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In the diagram shown alongside, the
cell and the ammeter both have negligible resistance.
The resistors are identical. With the switch K open, the
ammeter reads 0.6 A. What will be the ammeter reading
when the switch is closed?
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In the circuit diagram shown
alongside, find
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Total resistance.
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Current shown by the ammeter A
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