10th Class Physics Chapter 5 Current Electricity Short Question Answer

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10th Class Physics Chapter 5 Current Electricity Short Question Answer

Define resistance.

Define resistance.

Answer : The property of a substance which offers opposition to the flow of current through it is called its resistance. Its unit is Ohm
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State Ohm's law.

State Ohm's law.

Answer : the amount of current 1 passing through a conductor is directly proportional to the potential difference V applied across its ends provided the temperature and the physical state of the conductor, does not change. V=IR
Limitations: Ohm’s law is applicable only in case of metallic conductors when their temperature and physical state do not change.
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Differentiate between e.m.f and potential difference.

Differentiate between e.m.f and potential difference.

Answer : Potential difference:
1. Potential difference is smaller than e.m.f
2. Potential difference depends upon resistance.
3. Potential difference is result.
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Define electric current. Give its formula.

Define electric current. Give its formula.

Answer : The rate of flow of electric charge through any cross sectional area is called current.
Formula: I = Q/t
unit: Its S.I. unit is Ampere
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Define unit of electric current.

Define unit of electric current.

Answer : Unit of current is Ampere and defined as.
If one coulomb charge pass through an area in one second then current would be one Ampere. 1 Ampere = Cs-1
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Difference between conductor and insulator.

Difference between conductor and insulator.

Answer : Conductor: Such a material which allows electricity to pass through it, are called conductor e.g. metals are good conductors of electricity because they have free electrons.
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Discuss briefly the hazards of household electricity.

Discuss briefly the hazards of household electricity.

Answer : The damages of the electricity for life are called electricity hazards.The voltage of 50 V or 50 ma current could fatal for life.
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What is difference between cell and battery?

What is difference between cell and battery?

Answer : Cell: It is the source of e.m.f to flow the charges. Cell is a specific name of source of e.m.f in which chemical energy is converted into electrical energy.
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Difference between A.C and D.C current.

Difference between A.C and D.C current.

Answer : A.C:
1. The current which changes its direction of flow again and again, is known as alternating current or A.C.
2. Current produced from A.C generator.
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Define unit of resistance.

Define unit of resistance.

Answer : When a potential of one volt is applied across the end of conductor and one ampere of current passes through it, then its resistance will be one Ohm.
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Define electromotive force.

Define electromotive force.

Answer : The energy converted from non-electrical corms to electrical form when one coulomb of positive charge passes through the battery.
E.m.f = Energy/Change.
Its unitis volt(V)
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Describe four safety measures that should be taken in connection with the household circuit.

Describe four safety measures that should be taken in connection with the household circuit.

Answer :

i. Use of fuse
ii. Use of earth wire
iii. Use of circuit breakers
iv. Use of good insulated cables.

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Define conventional current.

Define conventional current.

Answer : Current flowing from positive to negative terminal of a battery due to the flow of positive charges is called conventional current.
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What is ammeter?

What is ammeter?

Answer : It is an instrument which is used to measure the quantity of current in the circuit. Its resistance is very low. It is always connected in series in the circuit.
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What is voltmeter?

What is voltmeter?

Answer : It is an instrument which is used to measure the voltage or potential difference across the appliance. It is also used the measure the e.m.fin battery. Its resistance is very high. It is always connected in parallel in the circuit.
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Can current flow in a circuit without potential difference?

Can current flow in a circuit without potential difference?

Answer : No, current cannot flow without the presence of a potential difference.
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Why a bird can sit harmlessly on high tension wires?

Why a bird can sit harmlessly on high tension wires?

Answer : Birds can sit harmlessly on tension wires. There is one potential but no potential difference which is necessary to flow the current.That is why the birds can sit on high tension wires safely.
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Define specific resistance.

Define specific resistance.

Answer : The resistance of one meter cube of a substance is equal to its specific resistance.It unit is Ohm meter.
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Define the time period of A.C.

Define the time period of A.C.

Answer : The time interval after which the A.C. voltage or current repeats its value is known as its time period.
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Define kilo watt hour.

Define kilo watt hour.

Answer : The amount of energy delivered by power of one kilo watt in one hour is called kilo watt hour.
1 kilo watt = 3.6 Mj
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Why does not diamond conduct electricity?

Why does not diamond conduct electricity?

Answer : Diamond does not conduct electricity. Because it has no free electrons.
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Define potential difference.

Define potential difference.

Answer : Potential difference across the two ends of a conductor causes the dissipation electrical energy into other forms of energy as charges flow through the circuit.
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What is galvanometer?

What is galvanometer?

Answer : It is an instrument which is used to indicate the presence of current in the circuit. It is very sensitive. Its resistance is very low. It is always connected in series in the circuit.
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Define electric power.

Define electric power.

Answer : The amount of energy supplied by current in unit time is known as electric power.
Units: Its unit is watt.
P = energy/ time.
Unit is joule
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What is fuse?

What is fuse?

Answer : Fuse is a safety device that is connected in series with live wire in the circuit to protect the equipment’s when excess of current flows.
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