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physics > Current Electricity > Flashcards

Current Electricity Flashcards

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1
Q

Voltage in power stations

A

5 × 10^5 volts

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2
Q

Voltage in homes

A

220 volts

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3
Q

voltage from eel

A

600 volts

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4
Q

Steady current

A

Continuous flow of electrons is called steady current

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5
Q

Electric Current

A

Directed flow of electrons

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6
Q

Current scalar or vector?

A

Scalar

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7
Q

Average speed of free electrons

A

10^5 m/s or several 100 km/s

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8
Q

Drift velocity?

A

The average velocity with which electrons get drifted in a metallic conductor under the influence of electric field.
10^-3 or 10^-5 m/s

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9
Q

Propagation of electric field speed?

A

At the speed of light.

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10
Q

Ohm’s law date?

A

by George Simone Ohm IN 1826

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11
Q

What should remain constant in ohms law?

A

Temperature, Physical state

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12
Q

Non ohmic

A

Filament of bulb,

semiconductor diode

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13
Q

Resistance depends upon?

A

Nature, dimensions, physical state of conductor

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14
Q

Slope of I-V graph gives?

A

1/R Conductance

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15
Q

Slope of non ohmic conductors

A

Decreases with increase of voltage

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16
Q

Graph bends upwards showing resistance decreases sharply as temperature increases

A

Thermistor

17
Q

Resistance SI unit

A

Ohm

18
Q

Conductance

A

SI: mho

Siemen (S)

19
Q

Conductivity

A

per ohm per m
mho/m
Siemen/meter
S/m

20
Q

Resistance increases with temperature:

Positive temperature coefficient

A

Pure metals

copper, aluminum etc.

21
Q

Resistance decreases with temperature

Negative temperature coefficient

A

Insulators, electrolytes:
glass, mica, rubber etc.
semiconductors:
Carbon graphite, Silicon, Germanium

22
Q

Potential at then ends of terminals a battery when circuit is open ?
(terminal potential difference)

A

emf

23
Q

The influence that causes current to flow from lower to higher potential?

A

emf

24
Q

Solar cell is also called

A

Radiant

25
Q

emf of short circuit is?

A

zero

26
Q

Maximum power output by?

A

Equal load resistance (R) and source resistance (r)

27
Q

Max brightness depends upon?

A

series :
direct proportional to R
parallel :
inversely proportional to R

physics (9 decks)

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