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Introduction to Electrical Systems and Chapter 1 1. What is voltage? A. The force that causes a circuit to energize. B. The force that works against resistance. C. The force that pushes electrons through the circuit. D. The force that causes heating and movement in electrical equipment. 2. What can cause death when a person is electrocuted? A. The electric shock stops the lungs from working B. The electric shock stops brain functions. C. Stops the heart or creates an irregular heart beat. D. All of the above. 3. What are the basic components of a simple electrical power circuit? A. Wire, switch, and a battery. B. Wire, lamp, and fuse. C. A voltage source, a pathway, and a load. D. A transformer, and a load. 4. How would you describe a short circuit? A. An electrical pathway with little or no voltage B. An electrical pathway offering little or no resistance C. A break in the circuit D. The shortest path of a closed circuit From the diagram below, select the correct number for the location for where each of the f a voltmeter may be placed to measure the voltage across the load. 5. A. #1 &#2 B. #3 & #4 C. #1 &#3 D. #2 & #3 L1 L2 #1 #4 S1 #2 #3 Load 6. What is the purpose of a fuse or circuit breaker in any electrical power circuit? A. Regulate current to devices and motors. B. Control voltages to ensure power quality& prevent damage from high or lowV C. Protect conductors and devices from overheating due to excess amperage. D. Provide a switching mechanism for the circuit
7. What is a ground circuit? A. A low resistance pathway for current to flow around a load. B. A high resistance pathway for current to flow to ground. C. A low resistance pathway for current flow to ground. D A high resistance pathway for current flow around a load. 8. What is the purpose of a ground circuit? A Safety circuit to prevent fires due to overheating. B. Safety circuit to prevent electric shock. C. Safety circuit to prevent high voltage at equipment. D. Safety circuit to prevent high frequency at equipment. 9. Which of the following is a characteristic of a Parallel Circuit? A. B. C. Parallel circuits have more than one pathway or branch. Most commercial circuits are parallel circuits. An open circuit in one branch of a parallel circuit de-energizes only that branch. D. All of the above 10. Which of the following is a characteristic of a Series Circuit? A. B. C. D. Series circuits have only one pathway through the whole circuit. A light switch is in series with the light it controls. An opening anywhere in a series circuit de-energizes the whole circuit. All of the above 11. Using Ohms Law, calculate the Watts used by a fluorescent ballast with the following nameplate information: Line Amps 0.50; Volts 120. A. 60W. B. 55 W C. 120 W D. 240 W 12. Using Ohms Law, calculate the Amps used by a 240 Watt electric heater if the voltage is 120V. A. 0.50 A B. 2.00 AC. 2.40 A D. 1.20 A 13. Using Ohms Law, calculate the resistance of a 300 W lamp in a 120 V circuit with 2.5 A of current flowing through it. A. 48 Ohms B. 125 Ohms In the following electrical circuit, if C. 288 Ohms D. 720 Ohms 14. the voltage supply Vs - 220 V (Calculate voltage across R5, current passing through R5, and PRs the power dissipated by R5. Ri 120 1000 R5 220V
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