10th Class Physics Chapter 5 Current Electricity Short Question Answer
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10th Class Physics Chapter 5 Current Electricity Short Question Answer
The property of a substance which offers opposition to the flow of current through it is called its resistance. Its unit is Ohm
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.
Potential difference:
1. Potential difference is smaller than e.m.f
2. Potential difference depends upon resistance.
3. Potential difference is result.
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
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
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.
The damages of the electricity for life are called electricity hazards.The voltage of 50 V or 50 ma current could fatal for life.
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.
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.
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.
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)
i. Use of fuse
ii. Use of earth wire
iii. Use of circuit breakers
iv. Use of good insulated cables.
Current flowing from positive to negative terminal of a battery due to the flow of positive charges is called conventional current.
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.
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.
No, current cannot flow without the presence of a potential difference.
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.
The resistance of one meter cube of a substance is equal to its specific resistance.It unit is Ohm meter.
The time interval after which the A.C. voltage or current repeats its value is known as its time period.
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
Diamond does not conduct electricity. Because it has no free electrons.
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.
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.
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
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.
