Electrostatic & Electrodynamics

Question 1

What is voltage?

Answer 1

Electromotive force (potential diffence)

Question 2

V=?

Answer 2

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

Question 3

Unit of voltage

Answer 3

Volts (v)

Question 4

Unit of energy

Answer 4

Joules ( J )

Question 5

Unit of charge

Answer 5

Coulombs (c)

Question 6

Unit of current

Answer 6

Amps (A)

Question 7

Unit of resistance

Answer 7

Ohms (omega)

Question 8

What is current?

Answer 8

Rate of flow of electrons

Question 9

I=?

Answer 9

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

Question 10

Unit of time

Answer 10

Seconds (s)

Question 11

What is resistance?

Answer 11

Opposition to the flow of electric current

Question 12

R=?

Answer 12

R= V/I

Question 13

What is electrical power?

Answer 13

Rate at which energy is transferred in a circut

Question 14

P=?

Answer 14

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

Question 15

Unit for power

Answer 15

Watts (W)

Question 16

What is coulombs law used for?

Answer 16

Calculating the force between 2 charged particles

Question 17

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

Answer 17

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

Question 18

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

Answer 18

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

Question 19

Formula for coulombs law, F =?

Answer 19

F= Ke( (Q1 • Q2) / r^2 )

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

Question 20

R=?
Mnemonic

Answer 20

R= roh ( L / A )

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

Question 21

What is the opposite of resistance & resistivity?

Answer 21

Conducting & conductor

Question 22

Symbols for resistor

Answer 22

Google answer

Question 23

Symbols for battery/power supply

Answer 23

Google answer

Question 24

Symbols for voltmeter & ammeter

Answer 24

Google answer

Question 25

What is Kirchhoff's first law?

Answer 25

Total current entering a junction = total current leaving the junction

Question 26

What is Kirchhoff's second law?

Answer 26

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

Question 27

If 1 thing in series circuit stops working what happens?

Answer 27

The whole circuit will stop working

Question 28

What happens to voltage in a series circuit?

Answer 28

It is shared across the components

Question 29

What is current in a series circuit?

Answer 29

Constant (identical across elements)

Question 30

What is the total resistance in a series circuit?

Answer 30

Sum of all individual resistances

Question 31

What happens to a parallel circuit if 1 loop breaks?

Answer 31

Circuit still remains in tact

Question 32

How is voltage distributed in parallel circuits?

Answer 32

All components in each loop get the full voltage

Question 33

How is current distributed in parallel circuits?

Answer 33

It is shared between the loops

Question 34

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

Answer 34

The total resistance decreases

Question 35

Formula for calculating total resistance for resistors in parallel

Answer 35

1 / R =1/R1 + 1/R2….

Question 36

Will resistance of a wire increase if voltage is increased?

Answer 36

No it is an inherent property

Question 37

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

Answer 37

It becomes stronger

Question 38

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

Answer 38

Magnetic field increases

Question 39

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

Answer 39

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

Question 40

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

Answer 40

The current alternates direction and ac current is generated

Question 41

What happens to the current when moving the magnet faster?

Answer 41

Current is stronger

Question 42

What happens to the current when using a stronger magnet?

Answer 42

Current also increases

Question 43

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

Answer 43

Current gets stronger

Question 44

What can be adjusted when using an electromagnet?

Answer 44

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

Question 45

Easy way to create a current in a coil?

Answer 45

Rotating a magnet & placing the coils around it

Question 46

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

Answer 46

At the ends where the magnetic field lines converge