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StudyTough > Electricity > Flashcards

Electricity Flashcards

1
Q

3 types of charge

A

Electron, proton, neutron

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2
Q

Charge on 1 electron

A

1.6 X 10^-19

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3
Q

Is water a good conductor?

A

Pure water (distilled water)- insulator
Impure or tap water- conductor

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4
Q

Charge is denoted by which letter?

A

Q

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5
Q

How to find charge?

A

Q=n*e
[(e)=1.6X10^-19]

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6
Q

How to find charge?

A

Q=n*e
[(e)=1.6X10^-19]

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7
Q

Number of electrons in one coulomb of charge

A

6.25 X 10^18

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8
Q

What is electric current?

A

Rate of flow of electric charges in a conductor

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9
Q

Current is denoted by which letter?

A

I

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10
Q

SI Unit of charge

A

Coulomb

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11
Q

SI unit of current

A

Ampere

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12
Q

Equation to find current

A

I(ampere)=Q(coulomb)/t(seconds)

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13
Q

Ampere can also be written as?

A

Coulomb/second

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14
Q

What is 1 ampere?

A

When 1 coulomb charge flows in 1 second in a conductor, then the current is said to be 1 ampere.

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15
Q

What is Ammeter?

A

An instrument to record and measure electric current.
Always connected in series.

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16
Q

What is galvanometer?

A

An instrument for measuring small electric currents.

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17
Q

What is potential difference?

A

Amount of work done in moving unit positive charge from a region of high concentration to low concentration in an electric field.

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18
Q

Potential difference is also called as?

A

Voltage

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19
Q

SI unit of potential difference

A

Volt

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20
Q

What is voltmeter?

A

An instrument for measuring the potential difference between 2 points in an electric circuit.

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21
Q

Potential difference is denoted through which letter?

A

V

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22
Q

Equation to find V?

A

V=W/Q
[(W)= Work done]
[(Q)= Charge]

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23
Q

Ohm’s law

A

Current flowing through a conductor is directly proportional to the potential difference applied across the ends of the conductor, at a particular temperature.

24
Q

Equation of ohm’s law

A

V directly proportional to I
By adding a constant
V=IR
[(R)=resistance]

25
Q

What is resistance?

A

Property of a conductor due to which a it opposes the flow of current through it.

26
Q

Resistance is denoted by which letter?

A

R

27
Q

SI unit of resistance

A

Ohm

28
Q

What is 1 ohm?

A

If 1 ampere of current flows through the conductor when a potential difference of 1 volt is being applied it, the resistance is said to be 1 ohm.

29
Q

Equation to find resistance

A

R=V/I

30
Q

Factors affecting resistance

A

Length
Area of cross section
Nature of material
Temperature

31
Q

What is an ohmmeter?

A

A device used for measuring resistance.

32
Q

What is resistivity?

A

Resistance of that material of unit length and unit cross-sectional area.

33
Q

Factors affecting resistivity?

A

Resistivity remains same always.

34
Q

The resistance of a conductor is directly proportional to?

A

It’s length
R proportional to L
[(L)=LENGTH]

35
Q

Resistance of a conductor is inversely proportional to?

A

It’s area of cross-section.
R proportional to L/A
[(A)= Area of cross-section]

36
Q

To make R equal to L/A, we add which constant?

A

Rho.
R=RhoL/A
Rho=RA/L

37
Q

Series circuit

A

Charge remains same throughout all resistors.
Voltage gets divided.

38
Q

Parallel circuit

A

Voltage remains the same.
Charge is divided inversely proportional to the resistance.

39
Q

Potential difference and resistance in series circuit.

A

V=V1+V2+V3……
V1= IR1
V2= IR2
V3= IR3
IR= IR1+IR2+IR3
R(net)= R1+R2+R3

40
Q

Potential difference and resistance in parallel circuit.

A

I=I1+I2+I3
I1=V/R1
I2=V/R2
I3=V/R3
V/R(net)= V/R1+V/R2+V/R3
1/R(net)= 1/R1+1/R2+1/R3

41
Q

Effects of current

A

Chemical effects of current.
Magnetic effects of current.
Heating effects of current.

42
Q

Joule’s law of heating

A

Heat generated in a conductor is directly linked to the square of current, resistance and the time period of the current flow.

43
Q

Equation of joule’s law of heating.

A

H= I^2RT

44
Q

Element used in the filament of the bulb

A

Tungsten

45
Q

The coils in a heater are made of?

A

Nichrome

46
Q

Electric Power

A

The rate at which electric energy is dissipated or consumed in an electric circuit.

47
Q

General equation to find power

A

P= V*I

48
Q

Another general equation to find power

A

P= W/T

49
Q

Equation to find power in a series circuit

A

P= I^2R

50
Q

Equation to find power in a parallel circuit

A

P= V^2/R

51
Q

SI unit of power

A

WATT

52
Q

1 watt

A

The power consumed by a device that carries 1 ampere of current when operated at a potential difference of 1 volt.

53
Q

A single term for 1000 watts

A

1 kilowatt

54
Q

Electric energy

A

Energy consumed by an electric circuit to flow current through it is referred to as electrical energy.

55
Q

Commercial unit of energy

A

Kwh

56
Q

1 Wh (watt hour)

A

Energy consumed when 1 watt of power is used for 1 hour.

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