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physics > Current Electricity > Flashcards

Current Electricity Flashcards

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1
Q

define electric current?
unit?
formula? symbol?
what produces current?

A

the time rate of flow of electric charges through any cross-sectional area
I=Q/t Ampere
I
Potential Difference

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2
Q

define one ampere?

A

when 1 C of charge flows through any cross sectional area in 1 sec

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3
Q

what is conventional flow of current?
why is CFOC used in problems?

A
  • current flowing from +ve terminal to -ve terminal of a battery due to the flow of +ve charges.
  • conventional current produces the same effect as the current flowing from -ve terminal to the +ve terminal due to the flow of -ve charges
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4
Q

materials are divided into conductors and insulators on the basis of?
example of them.
why current flows easily through conductors?

A

electric proprties (current flow)
c: copper silver Mg
semi: silicon germanium
i: glass and rubber
they have free charge carriers

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5
Q

what is potential difference?
where will be PD be produced in a circuit?
which terminal is at higher potential?
what provides PD in a circuit?
PD formula?

A

the diff. of EP b/w 2 points
b/w 2 ends of a conductor
+ve
battery\

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6
Q

the flow of current will continue as long as _________.
define 1 volt?

A

there is potential differnce.
when potential energy of 1 Joule is needed to move a charge of 1 Coulomb from one point to another inside the field.

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7
Q

what is emf?
why is it needed?
how does it happen?
explain the formula?
unit? symbol?

A

pg 107

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8
Q

what does Ohm’s law give relation of?
state it?
formula?
ohm law is applicable when?

A

pg 107

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9
Q

what is resistance?
unit? define 1 ohm?

A
  • opposition of flow of charges
  • volt per ampere called ohm
  • the resistance of wire will be 1 ohm if voltage of 1 volt causes a current of 1 ampere to flow thorugh the wire.
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10
Q

factors affecting resistance
_____ have high resistivity.
by increasing temp. resistance of conductors _____ insulators ____ why?

A

insulators

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11
Q

what is value of resistance dependent or independent from?
most ______ show ohmic behavior?define ohmic behavior?

A

i: volatge current as increase in volatge increase current so ratio would be same
d: upon material, temp.,length cross sectional area
metals

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12
Q

in series comb. of resistors what is same and diff and why?derive it also? will the eq. resistance smaller or bigger?

trust me its easy just use your mind

A

pg 111

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13
Q

in parallel comb. of resistors what is same and diff and why?derive it also? will the eq. resistance smaller or bigger?

trust me its easy just use your mind

A
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14
Q

ohm is the unit of what?
which resistor distributes V & I?
E=?
what are electrical measuring instruments?

A

resistance
V: series
I: parallel

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15
Q

derive the unit for electrical energy?

A

pg 115

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16
Q

what does Joule’s law provides us with? state it? mathematically?

A

it can provide the rate at which resistance in a circuit converts EI into HE

17
Q

what is electric power? formula?

A
18
Q

SI unit of electric power? define it?

A
19
Q

define 1 kilowatt-hour?
how many joules is it equal to?

A
20
Q

circuit symbol for lamp, switch, heater, resistor, capacitor, fuse, earth, power supply, wires?

A

pg 120

21
Q

use of wires, connectors, power supplies and fuse?

A
22
Q

what is earth in a circuit?

A

pg 119

23
Q

galvanometer?

A
24
Q

ammeter? how does it measure? why are ammeter connected in _______?

A

series

25
Q

voltmeter? measures?
why are they connected in?

A
26
Q

multimeter?

A

pg 122

27
Q

formula for cost of energy?
describe how energy is dissipiated in a resistane?

A

pg 116

28
Q

distinguish between AC and DC circuit sign for AC

A

pg 122

29
Q

why domestic supplies are connected in parallel?

A

pg 123

30
Q

function of live wire & neutral wire?

A
31
Q

earth wire funtion?

A
32
Q

the direction of current in a circuit depends upon?
make the diragram for ammeter & voltmeter.

A

the changing polarity of alternating voltage source

33
Q

describe domestic electrical circuits?
which wire when touched can cause and not cause electric shock?
which wire supplies and returns current?

A

live wire neutral wire
live wire neutral wire

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