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Physics 10 Chapter 14 - Current and Electricity - 26
1.
Into which energy, the iron converts heat energy generated in a resistance?
a) Nuclear energy
b) Mechanical energy
c) Heat energy
d) Light energy
2.
Into which energy, fans converts heat energy generated in a resistance?
a) Light energy
b) Nuclear energy
c) Mechanical energy
d) Heat energy
3.
What do we get, when current passes through a heater?
a) Light
b) Wind
c) Heat
d) Cool air
4.
If a current of 0.5 A passes through a bulb connected across a battery of 6 V for 20 seconds, then find the rate of energy transferred to the bulb?
a) 3 Watts
b) 60 Watts
c) 30 Watts
d) 6 Watts
5.
If a current of 0.5 A passes through a bulb connected across a battery of 6 V for 20 seconds, then find the resistance of the bulb?
a) 0.3 ohm
b) 6.0 ohm
c) 0.6 ohm
d) 3.0 ohm
6.
Energy-saver light bulbs transform much more of the electrical energy into......................?
a) Light energy
b) Mechanical energy
c) Heat energy
d) Nuclear energy
7.
Energy-saver light bulbs transform much less of the electrical energy into......................?
a) Light energy
b) Heat energy
c) Nuclear energy
d) Mechanical energy
8.
What is the power of an appliance that transfers 1 joule of electrical energy each second?
a) 10 watt
b) 0.1 watt
c) 100 watt
d) 1 watt
9.
If we double both the current and the voltage in a circuit while keeping its resistance constant, the power......................?
a) Halves
b) Remains unchanged
c) Becomes four times
d) Doubles
10.
What is the power of a light bulb that converts 60 J of electrical energy each second into light energy and heat energy?
a) 6 kW
b) 60 kW
c) 600 W
d) 60 W
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