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Technician License Course Chapter 3 Lesson Plan Module 5 Ohms Law, - PowerPoint PPT Presentation

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Technician License Course Chapter 3 Lesson Plan Module 5 Ohms Law, Power, and the Metric System Ohm s Law E represents voltage Units volts (V) I represents current Units amperes (A) R represents resistance

  1. Technician License Course Chapter 3 Lesson Plan Module 5 – Ohm’s Law, Power, and the Metric System

  2. Ohm ’s Law • E represents voltage – Units – volts (V) • I represents current – Units – amperes (A) • R represents resistance – Units – ohms ( Ω ) R = E / I I = E / R E = I x R 2014 Technician License Course

  3. Practice Questions 2014 Technician License Course

  4. What formula is used to calculate current in a circuit? A. Current (I) equals voltage (E) multiplied by resistance (R) B. Current (I) equals voltage (E) divided by resistance (R) C. Current (I) equals voltage (E) added to resistance (R) D. Current (I) equals voltage (E) minus resistance (R) T5D01 HRLM (3-4) 2014 Technician License Course

  5. What formula is used to calculate current in a circuit? A. Current (I) equals voltage (E) multiplied by resistance (R) B. Current (I) equals voltage (E) divided by resistance (R) C. Current (I) equals voltage (E) added to resistance (R) D. Current (I) equals voltage (E) minus resistance (R) T5D01 HRLM (3-4) 2014 Technician License Course

  6. What formula is used to calculate voltage in a circuit? A. Voltage (E) equals current (I) multiplied by resistance (R) B. Voltage (E) equals current (I) divided by resistance (R) C. Voltage (E) equals current (I) added to resistance (R) D. Voltage (E) equals current (I) minus resistance (R) T5D02 HRLM (3-4) 2014 Technician License Course

  7. What formula is used to calculate voltage in a circuit? A. Voltage (E) equals current (I) multiplied by resistance (R) B. Voltage (E) equals current (I) divided by resistance (R) C. Voltage (E) equals current (I) added to resistance (R) D. Voltage (E) equals current (I) minus resistance (R) T5D02 HRLM (3-4) 2014 Technician License Course

  8. What formula is used to calculate resistance in a circuit? A. Resistance (R) equals voltage (E) multiplied by current (I) B. Resistance (R) equals voltage (E) divided by current (I) C. Resistance (R) equals voltage (E) added to current (I) D. Resistance (R) equals voltage (E) minus current (I) T5D03 HRLM (3-4) 2014 Technician License Course

  9. What formula is used to calculate resistance in a circuit? A. Resistance (R) equals voltage (E) multiplied by current (I) B. Resistance (R) equals voltage (E) divided by current (I) C. Resistance (R) equals voltage (E) added to current (I) D. Resistance (R) equals voltage (E) minus current (I) T5D03 HRLM (3-4) 2014 Technician License Course

  10. What is the resistance of a circuit in which a current of 3 amperes flows through a resistor connected to 90 volts? A. 3 ohms B. 30 ohms C. 93 ohms D. 270 ohms T5D04 HRLM (3-5) 2014 Technician License Course

  11. What is the resistance of a circuit in which a current of 3 amperes flows through a resistor connected to 90 volts? A. 3 ohms B. 30 ohms C. 93 ohms D. 270 ohms T5D04 HRLM (3-5) 2014 Technician License Course

  12. What is the resistance in a circuit for which the applied voltage is 12 volts and the current flow is 1.5 amperes? A. 18 ohms B. 0.125 ohms C. 8 ohms D. 13.5 ohms T5D05 HRLM (3-5) 2014 Technician License Course

  13. What is the resistance in a circuit for which the applied voltage is 12 volts and the current flow is 1.5 amperes? A. 18 ohms B. 0.125 ohms C. 8 ohms D. 13.5 ohms T5D05 HRLM (3-5) 2014 Technician License Course

  14. What is the resistance of a circuit that draws 4 amperes from a 12-volt source? A. 3 ohms B. 16 ohms C. 48 ohms D. 8 ohms T5D06 HRLM (3-5) 2014 Technician License Course

  15. What is the resistance of a circuit that draws 4 amperes from a 12-volt source? A. 3 ohms B. 16 ohms C. 48 ohms D. 8 ohms T5D06 HRLM (3-5) 2014 Technician License Course

  16. What is the current flow in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms? A. 9600 amperes B. 200 amperes C. 0.667 amperes D. 1.5 amperes T5D07 HRLM (3-5) 2014 Technician License Course

  17. What is the current flow in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms? A. 9600 amperes B. 200 amperes C. 0.667 amperes D. 1.5 amperes T5D07 HRLM (3-5) 2014 Technician License Course

  18. What is the current flowing through a 100- ohm resistor connected across 200 volts? A. 20,000 amperes B. 0.5 amperes C. 2 amperes D. 100 amperes T5D08 HRLM (3-5) 2014 Technician License Course

  19. What is the current flowing through a 100- ohm resistor connected across 200 volts? A. 20,000 amperes B. 0.5 amperes C. 2 amperes D. 100 amperes T5D08 HRLM (3-5) 2014 Technician License Course

  20. What is the current flowing through a 24- ohm resistor connected across 240 volts? A. 24,000 amperes B. 0.1 amperes C. 10 amperes D. 216 amperes T5D09 HRLM (3-5) 2014 Technician License Course

  21. What is the current flowing through a 24- ohm resistor connected across 240 volts? A. 24,000 amperes B. 0.1 amperes C. 10 amperes D. 216 amperes T5D09 HRLM (3-5) 2014 Technician License Course

  22. What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it? A. 1 volt B. 0.25 volts C. 2.5 volts D. 1.5 volts T5D10 HRLM (3-5) 2014 Technician License Course

  23. What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it? A. 1 volt B. 0.25 volts C. 2.5 volts D. 1.5 volts T5D10 HRLM (3-5) 2014 Technician License Course

  24. What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it? A. 1 volt B. 10 volts C. 11 volts D. 9 volts T5D11 HRLM (3-5) 2014 Technician License Course

  25. What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it? A. 1 volt B. 10 volts C. 11 volts D. 9 volts T5D11 HRLM (3-5) 2014 Technician License Course

  26. What is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it? A. 8 volts B. 0.2 volts C. 12 volts D. 20 volts T5D12 HRLM (3-5) 2014 Technician License Course

  27. What is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it? A. 8 volts B. 0.2 volts C. 12 volts D. 20 volts T5D12 HRLM (3-5) 2014 Technician License Course

  28. Power - Electrons Doing Work and Expending Energy • Any time energy is expended, power is consumed. • Electrons moving through resistance expend electrical energy and consume power. • Power is the rate at which energy is consumed. • Power is measured in units of watts (W). 2014 Technician License Course

  29. Power Equation • Power is calculated as the product of voltage and current P = E x I E = P / I I = P / E • Like Ohm’s Law, if you know two of the values, you can calculate the third. 2014 Technician License Course

  30. Practice Questions 2014 Technician License Course

  31. Electrical power is measured in which of the following units? A. Volts B. Watts C. Ohms D. Amperes T5A02 HRLM (3-5) 2014 Technician License Course

  32. Electrical power is measured in which of the following units? A. Volts B. Watts C. Ohms D. Amperes T5A02 HRLM (3-5) 2014 Technician License Course

  33. Which term describes the rate at which electrical energy is used? A. Resistance B. Current C. Power D. Voltage T5A10 HRLM (3-5) 2014 Technician License Course

  34. Which term describes the rate at which electrical energy is used? A. Resistance B. Current C. Power D. Voltage T5A10 HRLM (3-5) 2014 Technician License Course

  35. What is the formula used to calculate electrical power in a DC circuit? A. Power (P) equals voltage (E) multiplied by current (I) B. Power (P) equals voltage (E) divided by current (I) C. Power (P) equals voltage (E) minus current (I) D. Power (P) equals voltage (E) plus current (I) T5C08 HRLM (3-5) 2014 Technician License Course

  36. What is the formula used to calculate electrical power in a DC circuit? A. Power (P) equals voltage (E) multiplied by current (I) B. Power (P) equals voltage (E) divided by current (I) C. Power (P) equals voltage (E) minus current (I) D. Power (P) equals voltage (E) plus current (I) T5C08 HRLM (3-5) 2014 Technician License Course

  37. How much power is being used in a circuit when the applied voltage is 13.8 volts DC and the current is 10 amperes? A. 138 watts B. 0.7 watts C. 23.8 watts D. 3.8 watts T5C09 HRLM (3-5) 2014 Technician License Course

  38. How much power is being used in a circuit when the applied voltage is 13.8 volts DC and the current is 10 amperes? A. 138 watts B. 0.7 watts C. 23.8 watts D. 3.8 watts T5C09 HRLM (3-5) 2014 Technician License Course

  39. How much power is being used in a circuit when the applied voltage is 12 volts DC and the current is 2.5 amperes? A. 4.8 watts B. 30 watts C. 14.5 watts D. 0.208 watts T5C10 HRLM (3-5) 2014 Technician License Course

  40. How much power is being used in a circuit when the applied voltage is 12 volts DC and the current is 2.5 amperes? A. 4.8 watts B. 30 watts C. 14.5 watts D. 0.208 watts T5C10 HRLM (3-5) 2014 Technician License Course

  41. How many amperes are flowing in a circuit when the applied voltage is 12 volts DC and the load is 120 watts? A. 0.1 amperes B. 10 amperes C. 12 amperes D. 132 amperes T5C11 HRLM (3-5) 2014 Technician License Course

  42. How many amperes are flowing in a circuit when the applied voltage is 12 volts DC and the load is 120 watts? A. 0.1 amperes B. 10 amperes C. 12 amperes D. 132 amperes T5C11 HRLM (3-5) 2014 Technician License Course

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