Download Work sheet 2 fundamentals of electricity The (engineering) unit used

Work sheet 2 fundamentals of electricity
1. The (engineering) unit used for measuring power is _________. [answer- watts or wattage]
2. In Ohm’s Law formula the letter “I” represents ______________. [answer- current]
3. Which letter is used to represent voltage in the Ohm’s Law formula? [answer- “E”]
4. In the Ohm’s Law formula the letter “R” represents resistance. Define resistance. [answeropposition to current flow]
5. The letters V, A and the symbol Ω are also used to represent Voltage, Amperage and resistance.
What is the general rule used when to use these letters? [answer when the value of the unit is
known]
6. If the value of the voltage remains the same and the value of the resistance decreases what will
happen to the value of the current? [answer the value of the current will increase]
7. If the value of the resistance remains the same and the value of the voltage decreases what will
happen to the value of the current? [answer the value of the current will decrease]
8. The type of voltage that the electrons flow only in one direction is known as ___________.
[answer- direct current or DC voltage]
9. What type of voltage does a battery supply? [answer- direct current voltage or DC]
10. True or False. A magnetic field is created when current flows through a conductor. [answer true]
11. True or False- When a wire moves through a magnetic field current flow is produced. [answer
true]
12. Voltage is also known as “potential”, “potential difference” and ______________. [answerelectromotive force or EMF]
13. What is the definition of electrical current? [answer- the flow of electrons]
14. True or False- Resistance can also be referred to as a load. [ answer true]
15. What is the definition of electrical power and what is the formula used to calculate it when the
voltage and current is known? [answer- electrical power is amount or rate of work done. P=I*E]
16. State the three parts of an electrical circuit. [answer- supply, path and load]
17. The symbol Ω represents ________. [answer- ohm]
18. A circuit has a supply voltage of 120 volts (V) and a current of 6 amps (A). What is the
resistance? [answer- 20 Ω ]
19. A circuit has a resistance of 30Ω and a current of 4A. What is the voltage? [answer- 120 V ]
20. A circuit has a supply of 240V and a resistance of 48Ω. What is the current [answer- 5 A]
21. A circuit has a supply of 240V and a current of 5A. What is the power used? [answer- 1200 W or
1200 watts]
22. A circuit has a resistance of 48Ω and a current of 5A. What is the power used? [answer-1200
watts of 1200W]
23. If a circuit uses 3600 watts and has a supply of 120 volts, how much current is the circuit drawing
(AKA- using)? [answer- 30 amps]. What is the resistance of the circuit? [answer- 4Ω]
24. If a circuit has a resistance of 10Ω and a supply of 480V, what is the power being used? [answer23,040 watts or 23.040 kW]
25. Complete the table for prefixes or terms of metric engineering units
Term
amount
letter
Term
amount
letter
micro
0.000001
µ
mili
0.001
m
kilo
1,000
k
Mega
1,000,000
M
micro
mili
kilo
Mega
Answer