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› Electricity Worksheet-19
Electricity Worksheet-19
Electricity Worksheet-19
An electric bulb draws 1.2 A current at 6.0 V. Find the resistance of the bulb.
Which will have a higher resistivity: a conductor or an insulator ?
Two wires of same material and same length have radii r
^{1}
and r
^{2}
respectively. Compare their resistances.
Name a substance whose resistance decreases with temperature.
Name a substance whose resistance almost remains unchanged by increase of temperature.
Distinguish between kilowatt and kilowatt hour.
Name two special characteristics of a heater coil.
A 60 W bulb carries a current 0.5 A. Find the charge that passes through it in 2 hour.
Calculate the current through a lamp of 25 W operating at 200 V.
Under what conditions is Ohm's law applicable?
Answer:
An insulator
If R
^{1}
and R
^{2}
are resistances of the two wires,
Germanium which is a semiconductor.
Manganin which is an alloy of Cu, Ni and Mn.
A kilowatt (kW) is a unit of power and a kilowatt hour (kWh) is a unit of electric energy.
1kWh = 1 kW × 1h.
A heater coil should have (i) high resistivity and (li) high melting point.
Q = It = 0.5 × (2 × 60 × 60)
= 3600 C.
If the physical conditions like temperature, etc., of a conductor do not change when current is passed through it.
View the discussion thread.