v- A. switch L only
- B. switch M only
- C. Switch M and N only
- D. either switch L or switches M and N
(d) either switch L or switches M and N
(d) either switch L or switches M and N
- A. 2.5 mA
- B. 25 mA
- C. 250 mA
- D. 2500 mA
(c) 250 mA
(c) 250 mA
v
False.
Electron flow is in the opposite direction to conventional current flow.
False.
Electron flow is in the opposite direction to conventional current flow.
False.
The fuse wire melts whenever there is overload in the wiring.
False.
The fuse wire melts whenever there is overload in the wiring.
True.
True.
False.The representation of the electric current is I.
False.The representation of the electric current is I.
True.
True.
Cell – A device which converts chemical energy into electrical energy
Switch – used to open or close a circuit
Circuit – A complete path for the flow of an electric current
Miniature circuit Breaker – Reset by hand, circuit becomes complete once again
Fuse – safety device used in electric circuit
V.Analogy:
Cell – A device which converts chemical energy into electrical energy
Switch – used to open or close a circuit
Circuit – A complete path for the flow of an electric current
Miniature circuit Breaker – Reset by hand, circuit becomes complete once again
Fuse – safety device used in electric circuit
V.Analogy:
wire
wire
insulator
insulator
ammeter
ammeter
10-6A
10-6A
- A. Both A and R are true and R is the correct explanation of A.
- B. Both A and R are true but R is NOT the correct explanation of A.
- C. A is true but R is false.
- D. A is false but R is true.
A. Both A and R are true and R is the correct explanation of A
A. Both A and R are true and R is the correct explanation of A
- A. If both A and R are true and the R is correct explanation of A.
- B. If both A and R are true but R is not a correct explanation of A.
- C. If A is true and R is false.
- D. If both A and R are false.
A. If both A and R are true and the R is correct explanation of A
A. If both A and R are true and the R is correct explanation of A
Current travels at the speed of 1/100th times the speed of light 0.0002 m/s.
Current travels at the speed of 1/100th times the speed of light 0.0002 m/s.
The SI unit of electrical conductivity is Siemens / metres (s/m).
The SI unit of electrical conductivity is Siemens / metres (s/m).
Electric cell.
Electric cell.
Electric fuse is a safety device which is used in household wiring and in many appliances.
Electric fuse is a safety device which is used in household wiring and in many appliances.
Electric bulb, geyser, Iron box.
Electric bulb, geyser, Iron box.
Rubber, wood, plastic, glass.
Rubber, wood, plastic, glass.
An electric current is measured by the amount of electric charge moving per unit time at any point in the circuit. The conventional symbol for current is I.
An electric current is measured by the amount of electric charge moving per unit time at any point in the circuit. The conventional symbol for current is I.
Parallel circuits:
It is connected by branches.
Voltage remains the same across each component of the circuit
Each bulb is fully powered.
All bulbs stay lit if one goes out.
Serial circuits:
It consist of single loop connection.
Current remains same in all parts of the circuit.
All the bulbs share power.
All bulbs go out if one goes out.
Parallel circuits:
It is connected by branches.
Voltage remains the same across each component of the circuit
Each bulb is fully powered.
All bulbs stay lit if one goes out.
Serial circuits:
It consist of single loop connection.
Current remains same in all parts of the circuit.
All the bulbs share power.
All bulbs go out if one goes out.
Electrical conductivity or specific conductance is the measure of a material’s ability to conduct an electric current.
Electrical conductivity or specific conductance is the measure of a material’s ability to conduct an electric current.
In telephones, a changing magnetic effect causes a thin sheet of metal (diaphragm) to vibrate. The diaphragm is made up a metal that can be attracted to magnets.
The diaphragm is attached to spring that is fixed to the earpiece.
When a current flows through the wires, the soft – iron bar becomes an electromagnet.
The diaphragm becomes attracted to the electromagnet.
As the person on the other end of the line speaks, his voice cause the current in the circuit to change. This causes the diaphragm in the earpiece to vibrate, producing sound.
In telephones, a changing magnetic effect causes a thin sheet of metal (diaphragm) to vibrate. The diaphragm is made up a metal that can be attracted to magnets.
The diaphragm is attached to spring that is fixed to the earpiece.
When a current flows through the wires, the soft – iron bar becomes an electromagnet.
The diaphragm becomes attracted to the electromagnet.
As the person on the other end of the line speaks, his voice cause the current in the circuit to change. This causes the diaphragm in the earpiece to vibrate, producing sound.
When an electric current passes through a wire, the electrical energy is converted to heat.
In heating appliances, the heating element is made up of materials with high melting point. An example of such a material is nichrome (an alloy of nickel, iron and chromium).
The heating effect of electric current has many practical applications.
The electric bulb, geyser, iron box, immersible water heater are based on this effect.
These appliances have heating coils of high resistance.
Generation of heat due to electric current is known as the heating effect of electricity.
When an electric current passes through a wire, the electrical energy is converted to heat.
In heating appliances, the heating element is made up of materials with high melting point. An example of such a material is nichrome (an alloy of nickel, iron and chromium).
The heating effect of electric current has many practical applications.
The electric bulb, geyser, iron box, immersible water heater are based on this effect.
These appliances have heating coils of high resistance.
Generation of heat due to electric current is known as the heating effect of electricity.
A dry cell is a portable form of a leclanche cell.
It consists of zinc vessel which acts as a negative electrode or anode.
The vessel contains a moist paste of saw dust saturated with a solution of ammonium chloride an chloride.
The ammonium chloride acts as an electrolyte.
The purpose of zinc pide is to maintain the moistness of the paste being highly gyroscopic.
The carbon rod covered with a brass cap is placed in the middle of the vessel. It acts as positive electrode or cathode.
It is surrounded by a closely packed mixture of charcoal and manganese dioxide (Mn0 2 ) in a muslin bag.
Here Mn0 2 acts as depolarizer. The zinc vessel is sealed at the top with pitch or shellac.
A small hole is provided in it to allow the gases formed by the chemical action to escape.
The chemical action inside the cell is the same as in avalanche cell.
A dry cell is a portable form of a leclanche cell.
It consists of zinc vessel which acts as a negative electrode or anode.
The vessel contains a moist paste of saw dust saturated with a solution of ammonium chloride an chloride.
The ammonium chloride acts as an electrolyte.
The purpose of zinc pide is to maintain the moistness of the paste being highly gyroscopic.
The carbon rod covered with a brass cap is placed in the middle of the vessel. It acts as positive electrode or cathode.
It is surrounded by a closely packed mixture of charcoal and manganese dioxide (Mn0 2 ) in a muslin bag.
Here Mn0 2 acts as depolarizer. The zinc vessel is sealed at the top with pitch or shellac.
A small hole is provided in it to allow the gases formed by the chemical action to escape.
The chemical action inside the cell is the same as in avalanche cell.
The possible reasons so that even at switch ‘ON’ position the bulb is not glowing are:
The cell may be discharge
The bulb may be fused.
The wire may be broken from inside
The connection may be loose.
The possible reasons so that even at switch ‘ON’ position the bulb is not glowing are:
The cell may be discharge
The bulb may be fused.
The wire may be broken from inside
The connection may be loose.
v- A. 4A
- B. 6 A
- C. 10 A
- D. 16 A
PR + OR = RS
PR + 6A = 10A
PR = 10A- 6A = 4A
PR + OR = RS
PR + 6A = 10A
PR = 10A- 6A = 4A
v
v- A. SI, S2 and S4 only
- B. SI, S3 and S5 only
- C. S2, S3 and S4 only
- D. S2, S3 and S5 only
(c) S2, S3 and S4 only
(c) S2, S3 and S4 only
v- A. A only
- B. C only
- C. A and B only
- D. A, B and C
(c) A and B only
(c) A and B only
I will recharge immediately
I will recharge immediately