2. Electricity

Question 1

What is the charge of an electron

Answer 1

-1.6x10^ -19 C

Question 2

What are the four laws of electrostatics?

Answer 2

1. Opposites attract, like repel
2. Charge is usually distributed evenly around objects
3. Charges concentrate around sharp corners
4. Coulomb’s law

Question 3

Explain the difference between mA and mAs

Answer 3

mA=The total amount of electrons from the cathode to the anode per second
mAs= The total number of x rays produced in a beam

Question 4

Define effective value (RMS)

Answer 4

The value of the constant DC current that would generate the same amount of heat in an AC current?

Question 5

Is there potential energy in insulators?

Answer 5

No, bc the current should not flow through, there are no electrons in the conduction band

Question 6

Give 3 examples of conductors

Answer 6

1. Copper
2. Gold
3. Silver

Question 7

What are the factors affecting resistance? Explain.

Answer 7

1. Materials: Whether its a conductor or resistor
2. Area: As the area increases, R decreases (2xA=1/2 R)
3. Length: As the length increases, so does R bc there is more to pass by
4. Temp:
   -An increase in T in conductor=Increased R
   -An increase in T in insulator=Decreased R

Question 8

In which circuit does Voltage drop as it goes through resistors?

Answer 8

Series

Question 9

What are three examples of circuit safety?

Answer 9

1. Grounding
2. Fuses and Circuit breakers
3. GFCI

Question 10

Define power:

Answer 10

The rate at which work is being done

Question 11

When energy is needed to overcome resistance, in which way does energy go down?

Answer 11

Voltage goes down, we see it in the form of heat in series circuits

Question 12

What are the 3 uses of capacitators?

Answer 12

1. Waveform smoothing
2. Electrical storage
3. Timer circuits