28/03/2020 Current Electricity and Electrical Quantities(Senior Class Physics Study by Topics) 28/03/2020 0Comments by Gate Academy Welcome to your Current Electricity and Electrical Quantities(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. In a ____________ the switch is closed and electric current flows from the source through the connection device. Open circuit Closed circuit Light bulb Wire 2. What kind of charge does an electron have? Nuetral Positive Negative 3. The bulbs A, B and C are connected as shown in Figure. The bulbs B and C are identical. If the bulb C is fused, A will glow less brightly and B will glow more brightly, Both A and B will glow more brighty, Both A and B will glow less brightly, A will glow more brightly and B will glow less brightly. 4. If a high power heater is connected to electric mains, then the bulbs in the house become dim, because there is a Current drop Potential drop No potential drop No current drop 5. What ultimately happens to the cow in this situation? During a thunderstorm, if lightning hits the ground near a cow, then the current starts to spread out in the groud. Since the ground is wet, it is easier to spread horizontally, and also, the ground is somewhat positively charged. When the current starts to spread while a cow is eating grass, the current flows from the cow's mouth (A), goes through its leg (B) and goes back to the ground. The current will flow until the voltage becomes zero. Because cow's hind leg (D) has lower potential energy than its front leg (C), the current can flow through the cow. The cow becomes a part of the electric circuit. The cow gets a big electric shock and probably dies The cow feels a slight tingle but continues eating. All the current builds up in the cow's bell which will shock the rancher later. Nothing happens to the cow. 6. There is no met movement of electrons in one direction. False True 7. What is the unit for current? Joules Ohms Volts Amperes 8. Electric current loses energy as it moves through the filament because the filament ____ the flow of ____. Electrons, resists Inhibits, electrons Resists, electrons Protons, inhibits 9. Which of the following MUST a circuit have? Wires and a power source and another component Components and wires Wires and a lamp A battery and a lamp 10. What is a steady flow of electricity called? A terminal A current A charge 11. What do we call the materials which electricity can flow through easily Conductors Resistors Insulators 12. Which of these materials is a good conductor? Gold Wool Plastic 13. Which of these materials is an insulator? Aluminum foil Rubber Copper 14. What device opens and closes an electric circuit? A power source A load A switch 15. The current in a circuit equals the voltage difference divided by the resistance. Law of compliance Ohms Law Law of resistance Conductivity Law 16. Current flows as long as there is a closed path that connects one battery terminal to the other battery terminal. True False 17. In which direction does electric current flow around a circuit. Positive to Negative Anti-clockwise Clockwise Negative to Positive 18. Which of these is NOT required in order to have a complete circuit? Light switch Load or resistor Wires or path Source of electricity 19. The I-V characteristics of two electrical components P and Q are shown belowWhich of these statements is incorrect The resistance of Q decreases as the current in it increases At 0.5 A the power dissipated in Q is double that in P At 1.9A the resistance of Q is approximately half of that of P P is a metallic conductor and Q is a thermistor 20. There are four places that must be connected on the battery and bulb in order for the bulb to light. False True 21. What is the unit for voltage? Amperes Ohms Volts Joules 22. Which of the following is not TRUE for electrons Electrons are attracted to other things with a negative charge Electrons are attracted to things with a positive charge Electrons have a negative charge 23. When an electric current flows through a wire what is moving? Molecules move along the wire Protons move along the wire Atoms move along the wire Electrons move along along the wire 24. A set of lights consists of 20 identical lamps connected in series to a 240 V mains supply.What is the potential difference across each lamp? 0.08V 12V 6V 4800V 25. According to Faraday's law of electrolysis, when a current is passed, the mass of ions deposited at the cathode is independent of Resistance Current Charge Time 1 out of 25 Time is Up! Time's up
