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Physics > Electrostatic & Electrodynamics > Flashcards

Electrostatic & Electrodynamics Flashcards

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1
Q

What is voltage?

A

Electromotive force (potential diffence)

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2
Q

V=?

A

V = E/Q (energy/charge)
V = lR ( current • resistance)

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3
Q

Unit of voltage

A

Volts (v)

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4
Q

Unit of energy

A

Joules ( J )

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5
Q

Unit of charge

A

Coulombs (c)

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6
Q

Unit of current

A

Amps (A)

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7
Q

Unit of resistance

A

Ohms (omega)

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8
Q

What is current?

A

Rate of flow of electrons

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9
Q

I=?

A

I= Q/t ( charge / time )
I= V/R

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10
Q

Unit of time

A

Seconds (s)

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11
Q

What is resistance?

A

Opposition to the flow of electric current

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12
Q

R=?

A

R= V/I

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13
Q

What is electrical power?

A

Rate at which energy is transferred in a circut

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14
Q

P=?

A

P= E/t (energy/time)
P= IV (current • voltage)

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15
Q

Unit for power

A

Watts (W)

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16
Q

What is coulombs law used for?

A

Calculating the force between 2 charged particles

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17
Q

What happens when you get a positive value when calculating using coulombs law?

A

Particles repel eachother (as they were either both positive or negative)

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18
Q

What happens when you get a negative value when calculating using coulombs law?

A

Particles attract (since one is negative & one is positive)

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19
Q

Formula for coulombs law, F =?

A

F= Ke( (Q1 • Q2) / r^2 )

F= force
Ke= Coulomb’s constant
Q1= charge of particle 1
Q2= charge of particle 2
r= radius

20
Q

R=?
Mnemonic

A

R= roh ( L / A )

R= resistance
Roh= resistivity
L= length
A= area
Replay

21
Q

What is the opposite of resistance & resistivity?

A

Conducting & conductor

22
Q

Symbols for resistor

A

Google answer

23
Q

Symbols for battery/power supply

A

Google answer

24
Q

Symbols for voltmeter & ammeter

A

Google answer

25
Q

What is Kirchhoff’s first law?

A

Total current entering a junction = total current leaving the junction

26
Q

What is Kirchhoff’s second law?

A

The direct sum of the potential differences (voltages) around any closed loop is zero

27
Q

If 1 thing in series circuit stops working what happens?

A

The whole circuit will stop working

28
Q

What happens to voltage in a series circuit?

A

It is shared across the components

29
Q

What is current in a series circuit?

A

Constant (identical across elements)

30
Q

What is the total resistance in a series circuit?

A

Sum of all individual resistances

31
Q

What happens to a parallel circuit if 1 loop breaks?

A

Circuit still remains in tact

32
Q

How is voltage distributed in parallel circuits?

A

All components in each loop get the full voltage

33
Q

How is current distributed in parallel circuits?

A

It is shared between the loops

34
Q

What happens to the total resistance of a parallel circuit when we add more loops with components?

A

The total resistance decreases

35
Q

Formula for calculating total resistance for resistors in parallel

A

1 / R =1/R1 + 1/R2….

36
Q

Will resistance of a wire increase if voltage is increased?

A

No it is an inherent property

37
Q

What happens to the magnetic field when the wire is wrapped into a coil?

A

It becomes stronger

38
Q

What happens to electromagnetic field of a wire coil when current is increased?

A

Magnetic field increases

39
Q

What kind of current is generated when a magnet is passed through a wire coil in one direction?

A

The amp meter shows a current is generated, a dc current

40
Q

What kind of current is generated when a magnet is passed through a wire coil in alternating directions?

A

The current alternates direction and ac current is generated

41
Q

What happens to the current when moving the magnet faster?

A

Current is stronger

42
Q

What happens to the current when using a stronger magnet?

A

Current also increases

43
Q

What happens to the current when using a larger coil with more turns?

A

Current gets stronger

44
Q

What can be adjusted when using an electromagnet?

A

The current & voltage to vary the strength of the magnetic field & the induced current

45
Q

Easy way to create a current in a coil?

A

Rotating a magnet & placing the coils around it

46
Q

Where is the strongest part of the magnetic field on a magnet?

A

At the ends where the magnetic field lines converge

Physics (8 decks)

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