Electricity and Electromagnetism

Question 1

What is charge measured in?

Answer 1

Coulombs (Q)

Question 2

Electric field strength is can be seen as two different ratios. What is Field Strength (E) equal to?

Answer 2

E= V/d (volts per meter)
or
E= F/q (Newtons per coulomb)

Question 3

What is potential gradient?

Answer 3

The rate at which voltage changes (v/d). as E= v/d, potential gradient can be seen as field strength.

Question 4

What charge do electric field lines always point to?

Answer 4

Negative

Question 5

What pole do magnetic field lines always point to?

Answer 5

South

Question 6

Electric Potential energy in an electric field is equal to what?

Answer 6

Field strength times charge times distance (EQD)

Question 7

What is the movement of charged particles called?

Answer 7

Current (amps)

Question 8

In what direction does convention current run?

Answer 8

From positive to negative

Question 9

What is the basic equation for current?

Answer 9

I= q/t (current per unit of time)

Question 10

voltage is equal to ▲E/q. What does this mean in real terms?

Answer 10

Voltage can be seen as how much potential energy each coulomb of charge has (it is almost like the electromotive force on the electrons)

Question 11

If two 1.5 volt cells are in series, what is the total circuit voltage?

Answer 11

3 volts (voltage is added when in series)

Question 12

What is the equation for force on a charged particle in an electrical field

Answer 12

F=Eq

Question 13

In a series circuit, how would you describe current in the circuit?

Answer 13

It is the same at all points in the circuit.

Question 14

The sum of the voltages across components in a series circuit is equal to…

Answer 14

The total circuit voltage

Question 15

In a parallel branch of a circuit, current is divided, and…

Answer 15

Rejoins at the same amount at which is split.

Question 16

Voltages for two components in parallel will be…

Answer 16

The same ( V=IR, R is constant and I changes proportionally to R, so V is constant)

Question 17

Ohm’s law is…

Answer 17

V=IR

Question 18

What is the relationship between resistors in series?

Answer 18

Rt = R1 + R2 + R3….

Question 19

What is the relationship between resistors in parallel?

Answer 19

1/Rt= 1/R1 + 1/R2 + 1/R3…

Question 20

What is power?

Answer 20

Energy transferred (work done) over time (in this case, ▲E/t)

Question 21

If a conductor is ohmic, what does this mean?

Answer 21

Resistance is constant (voltage and current increase in turn with each other)

Question 22

What is energy transferred equal to?

Answer 22

E = V x I x t

Question 23

What is power equal to?

Answer 23

P = V x I

Question 24

Moving electrons cause a…

Answer 24

magnetic field

Question 25

What “rule” determines the magnetic field caused by a wire with current flowing through it?

Answer 25

The right hand grip rule
Thumb = conventional current direction
Fingers = Magnetic field lines

Question 26

What is the equation for the force exerted by a magnetic field on a charged particle?

Answer 26

F=BQV
F = force
q = charge on particle
v = velocity of particle

Question 27

What rule helps you determine the direction of force on a positive particle on a magnetic field?

Answer 27

Right hand slap rule
Palm = force
Fingers = field lines
thumb = direction of velocity (remember, conventional current is + particles)

Question 28

What rule helps you determine the direction of force on a negative particle on a magnetic field?

Answer 28

Right hand slap rule
Palm = force
Fingers = field lines
Thumb = OPPOSITE OF direction of velocity

Question 29

What rule helps you determine the direction of force on a wire?

Answer 29

Right-hand slap rule