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