Chapter 11.2

Question 1

Equation for emf induced in an AC generator coil

Answer 1

V = −dΦ/dt
= ωNBAsin(ωt)

Question 2

Formula for maximum power dissipated in an AC generator

Answer 2

Pmax = V0I0

V0 = Maximum voltage
I0 = Maximum current

Question 3

How do you find the average power dissipated in an AC generator?

Answer 3

Halve the maximum power

Question 4

Equation for current in an AC generator coil

Answer 4

I = I0sin(ωt)

I0 = V0/R

Question 5

Root mean square

Answer 5

The average value of the current or voltage in an AC circuit

Question 6

Formula for rms of current in an AC circuit

Answer 6

I(rms) = I0/√2

Question 7

Formula for rms of voltage in an AC circuit

Answer 7

V(rms) = V0/√2

Question 8

Tranformer

Answer 8

A device that takes a certain ac voltage as input and delivers a different ac voltage as output

Question 9

Sources of power loss in transformers

Answer 9

Eddy currents
Magnetic hysteresis

Question 10

Eddy current

Answer 10

Tiny currents created in the core of a transformer because the free electrons of the core move in the presence of a magnetic field

Question 11

Half-wave rectification

Answer 11

When the output from a diode is always positive but not constant in magnitude so that half the power is lost

Question 12

Diode bridge rectifier

Answer 12

Used to achieve full-wave rectification

Question 13

Full-wave rectification

Answer 13

When all the current in an AC current is rectified and all power is preserved