1. Technician Licensing Class
It’s the Law, per Mr. Ohm!
Valid July 1, 2014
Through
June 30, 2018 1

2. Amateur Radio Technician Class Element 2 Course Presentation
ELEMENT 2 SUB-ELEMENTS (Groupings)
About Ham Radio
Call Signs
Control
Mind the Rules
Tech Frequencies
Your First Radio
Going On The Air!
Repeaters
Emergency!
Weak Signal Propagation 2

3. Amateur Radio Technician Class Element 2 Course Presentation
ELEMENT 2 SUB-ELEMENTS (Groupings)
Talk to Outer Space!
Your Computer Goes Ham Digital!
Multi-Mode Radio Excitement
Run Some Interference Protection
Electrons – Go With the Flow!
It’s the Law, per Mr. Ohm!
Picture This!
Antennas
Feed Me with Some Good Coax!
Safety First! 3

4. It’s the Law, per Mr. Ohm!
The term that describes the rate at which electrical energy is used is called Power. T5A10
The basic unit of electrical power is measured in Watts. T5A02
The formula used to calculate electrical power in a DC circuit is Power (P) equals voltage (E) multiplied by current (I). T5C08 4

5. It’s the Law, per Mr. Ohm!
The power being used in a circuit when the applied voltage is 13.8 volts DC and the current is 10 amperes is: T5C09
Solving for “P” so cover up the P and plug in the other two numbers
E is given as 13.8 volts and I is given as 10 amperes
The power being used in a circuit when the applied voltage is 13.8 volts DC and the current is 10 amperes is: T5C09
P = I x E
P = 10 x 13.8
P = 138 Watts

6. It’s the Law, per Mr. Ohm!
The power being used in a circuit when the applied voltage is 12 volts DC and the current is 2.5 amperes is:T5C10
Solving for “P” so cover up the “P” and plug in the other two numbers
E is given as 12 volts and I is given as 2.5 amperes
P = I x E
P = 2.5 x 12
P = 30 watts

7. It’s the Law, per Mr. Ohm!
The amount of current flowing in a circuit when the power in a circuit is 120 watts and the applied voltage is 12 volts is:T5C11
Solving for “I” so cover up the “I” and plug in the other two numbers
P is given as 120 watts and E is given as 12 volts and
I = P / E
I = 120  12
I = 10 Amperes 7

8. It’s the Law, per Mr. Ohm!
This formula us used to calculate voltage in a circuit: Voltage (E) equals Current (I) multiplied by Resistance (R). T5D02
E = I R

9. It’s the Law, per Mr. Ohm!
The voltage across a 2-ohm resistor if a current of 0.5 amperes flows thru it is:T5D10
E = I x R
E = 0.5 x 2
E = 1 Volt 9

10. It’s the Law, per Mr. Ohm!
The voltage across a 10-ohm resistor if a current of 1 amperes flows thru it is: T5D11
E = I x R
E = 1.0 x 10
E = 10 Volts 10

11. It’s the Law, per Mr. Ohm!
The voltage across a 10-ohm resistor if a current of 2 amperes flows thru it is: T5D12
E = I x R
E = 2.0 x 10
E = 20 Volts 11

12. It’s the Law, per Mr. Ohm!
The formula used to calculate current in a circuit is Current (I) equals Voltage (E) divided by Resistance (R). T5D01 12

13. It’s the Law, per Mr. Ohm!
The current flowing thru a 24-ohm resistor connected across 240 volts is: T5D09
I = E / R
I = 240  24
I = 10 Amperes 13

14. It’s the Law, per Mr. Ohm!
The current flowing thru a 100-ohm resistor connected across 200 volts is: T5D08
I = E / R
I = 200  100
I = 2 Amperes 14

15. It’s the Law, per Mr. Ohm!
The current flowing thru a 80-ohm resistor connected across 120 volts is: T5D07
I = E / R
I = 120  80
I = 1.5 Amperes 15

16. It’s the Law, per Mr. Ohm!
This formula us used to calculate resistance in a circuit: Resistance (R) equals Voltage (E) divided by Current (I).T5D03 16

17. It’s the Law, per Mr. Ohm!
The resistance of a circuit in which a current of 3 amperes flows thru a resistor connected to 90 volts is: T5D04
R = E / I
R = 90  3
R = 30 Ohms 17

18. It’s the Law, per Mr. Ohm!
The resistance of a circuit in which the applied voltage is 12 volts and the current flow is 1.5 amperes is: T5D05
R = E / I
R = 12  1.5
R = 8 Ohms 18

19. It’s the Law, per Mr. Ohm!
The resistance of a circuit that draws 4 amperes from a 12-volt source is: T5D06
R = E / I
R = 12  4
R = 3 Ohms 19

20. It’s the Law, per Mr. Ohm! 20

21. Element 2 Technician Class Question Pool
It’s the Law, per Mr. Ohm!
Valid July 1, 2014
Through
June 30, 2018

22. T5A10. Which term describes the rate at which electrical
T5A10 Which term describes the rate at which electrical energy is used?
Resistance
Current
Power
Voltage

23. T5A02 Electrical power is measured in which of the following units?
Volts
Watts
Ohms
Amperes

24. T5C08. What is the formula used to calculate
T5C08 What is the formula used to calculate electrical power in a DC circuit?
Power (P) equals voltage (E) multiplied by current (I)
Power (P) equals voltage (E) divided by current (I)
Power (P) equals voltage (E) minus current (I)
Power (P) equals voltage (E) plus current (I)

25. T5C09. How much power is being used in a circuit when
T5C09 How much power is being used in a circuit when the applied voltage is 13.8 volts DC and the current is 10 amperes?
138 watts
0.7 watts
23.8 watts
3.8 watts

26. T5C10. How much power is being used in a circuit when
T5C10 How much power is being used in a circuit when the applied voltage is 12 volts DC and the current is 2.5 amperes?
4.8 watts
30 watts
14.5 watts
0.208 watts

27. T5C11. How many amperes are flowing in a circuit when
T5C11 How many amperes are flowing in a circuit when the applied voltage is 12 volts DC and the load is watts?
0.1 amperes
10 amperes
12 amperes
132 amperes

28. T5D02 What formula is used to calculate voltage in a circuit?
Voltage (E) equals current (I) multiplied by resistance (R)
Voltage (E) equals current (I) divided by resistance (R)
Voltage (E) equals current (I) added to resistance (R)
Voltage (E) equals current (I) minus resistance (R)

29. T5D10. What is the voltage across a 2-ohm resistor if a. current of 0
T5D10 What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it?
1 volt
0.25 volts
2.5 volts
1.5 volts

30. T5D11. What is the voltage across a 10-ohm resistor if a
T5D11 What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it?
1 volt
10 volts
11 volts
9 volts

31. T5D12. What is the voltage across a 10-ohm resistor if a
T5D12 What is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it?
8 volts
0.2 volts
12 volts
20 volts

32. T5D01 What formula is used to calculate current in a circuit?
Current (I) equals voltage (E) multiplied by resistance (R)
Current (I) equals voltage (E) divided by resistance (R)
Current (I) equals voltage (E) added to resistance (R)
Current (I) equals voltage (E) minus resistance (R)

33. T5D09. What is the current flowing through a 24-ohm
T5D09 What is the current flowing through a 24-ohm resistor connected across 240 volts?
24,000 amperes
0.1 amperes
10 amperes
216 amperes

34. T5D08. What is the current flowing through a 100-ohm
T5D08 What is the current flowing through a 100-ohm resistor connected across 200 volts?
20,000 amperes
0.5 amperes
2 amperes
100 amperes

35. T5D07. What is the current flow in a circuit with an
T5D07 What is the current flow in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms?
9600 amperes
200 amperes
0.667 amperes
1.5 amperes

36. T5D03 What formula is used to calculate resistance in a circuit?
Resistance (R) equals voltage (E) multiplied by current (I)
Resistance (R) equals voltage (E) divided by current (I)
Resistance (R) equals voltage (E) added to current (I)
Resistance (R) equals voltage (E) minus current (I)

37. T5D04. What is the resistance of a circuit in which a
T5D04 What is the resistance of a circuit in which a current of 3 amperes flows through a resistor connected to 90 volts?
3 ohms
30 ohms
93 ohms
270 ohms

38. T5D05. What is the resistance in a circuit for which the
T5D05 What is the resistance in a circuit for which the applied voltage is 12 volts and the current flow is amperes?
18 ohms
0.125 ohms
8 ohms
13.5 ohms

39. T5D06. What is the resistance of a circuit that. draws 4
T5D06 What is the resistance of a circuit that draws 4 amperes from a 12-volt source?
3 ohms
16 ohms
48 ohms
8 ohms