28/03/2020 Electrical Circuits and Dangers of Electricity(Senior Class Physics Study by Topics) 28/03/2020 0Comments by Gate Academy Welcome to your Electrical Circuits and Dangers of Electricity(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. An outlet where one or more receptacles are installed. Outlet Receptacle Outlet Watertight Approved 2. Extension cords have the following except A fuse UL Listing Three prongs All of the above 3. What is current electricity? Continuous flow of electrons in a circuit Energy stored within an item, that it then released A charge that is built up then dispersed 4. What is an energy storage device composed of electrochemical cells? A circuit A battery A fuse A flashlight 5. Which of these is NOT required in order to have a complete circuit? Source of electricity Load or resistor Wires or path Light switch 6. If the resistance in the circuit is 10 Ω and the current is 3 A, what is the voltage of the battery? 30 V 3 V 3.33 V 10 A 7. The difference between DC and AC is that AC is Safer Bi-directional Faster Always constant 8. The of the following are classified as unsafe acts except Altering a 3-prong plug to fit a 2-prong outlet All of the above Working too close to overhead power lines Using a GFCI 9. Switching surge is High voltage dc Hyperbolically dying voltage. Short duration transient voltage High voltage ac 10. Electric current in a/an ____________________ circuit travels in MORE THAN ONE path. Wire Series Parallel Connected 11. Reaction to static electric shock may cause injury. True False 12. You have fuses instead of breakers in your house. One is blown. How do you know it's an overload, and not a short circuit? The glass on the fuse is broken The filament is broken inside the fuse The glass is blackened out. The fuse is totally melted 13. In which circumstances are contact with electricity most likely to be harmful. Touching a 24 V dc battery terminal with hand. Using a faulty 110V ac power tool in a damp environment Using a faulty 240Vac power tool with RCD 14. If the voltage is 12 V and the resistance in the wire is 3 Ω, what is the the current in the circuit? 2 A 6 A 4 A 12 A 15. The severity of a shock depends on what? All of the above The amount of current (amps) The duration of the shock The path of the current through your body 16. What is a steady flow of electricity called? A terminal A current A charge 17. What is static electricity caused by? A balance of power An imbalance of positive and negative charges A balance of positive and negative charges 18. Which of the following describes a series circuit? If one bulb breaks the other one still works Current flows along each branch Bulbs are all in a loop 19. Minimum insulation resistance value recommended for LV machines as 1M Ohm/1000V 2M Ohm/1000V 1000K Ohm/1000VAC A&C 20. Which of the following is NOT a good insulator? Plastic Glass Iron 21. The following is an example of work that may be performed by a person who is not an electrician Use of proper extension cord to power an appliance for a short time Removal of grounding pin from appliance cord plug Construction of an extension cord using a standard junction box None of the above 22. What does each colour represent in 4-conductor electrical wire? Red=ground, Black=neutral, White=hot, Green=hot Red=hot, Black-ground, White=hot, Green=neutral Red=hot, Black=hot, white=neutral, green=ground Red=neutral, Black=hot, white=ground, green=hot 23. You have a bad breaker in your panel box, so you go down to the hardware store and the guy tells you that you can use any kind of breaker as long as it's the same amperage. True False 24. A current needs a path to flow along, also known as a Power source Resistor Circuit 25. If a 100 resistor suddenly became open in series circuit, what would happen to the current? It would become maximum value It would become zero It would decrease only slightly It would stay the same 1 out of 25 Time is Up! Time's up
