29/03/2020 D.C Circuits(Senior Class Physics Study by Topics) 29/03/2020 0Comments by Gate Academy Welcome to your D.C Circuits(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. Potential difference between ends of conductor maintained by the battery is different zero one constant 2. Specific resistance of a wire can be written as RL/A RA/L R/L A/RL 3. In the diagram above, resistors R1 and R2 are shown in two different connections to the same battery with an emf (voltage) ε. Assume no internal resistance. How does the power dissipated by the resistors in these two cases compare? It is different for each connection, but one must know the values of R1 and R2 to know which is greater It is the same for both connections It is greater for the parallel connection It is greater for the series connection 4. The current through the potentiometer is 17 mA and its value is 1.22KΩ. The power is 350 mW 0.24 μW 20.7 mW 20.7 W 5. A resistor is connected to a battery. If you replace the resistor with one that has twice the resistance, by what factor does the power dissipated in the circuit change? Half as much power is dissipated. Twice as much power is dissipated. There is no change in power dissipation if the voltage is unchanged. One fourth as much power is dissipated 6. EMF means electronic motive force electromotive force electrical motive force none of these 7. Suppose that a circuit has 472 Ω of resistance and the current is 875 mA. Then the source voltage is 0.539 V 413 V 1.85 V None of the above 8. Resistors are rated in Volts Joules Watts Amps 9. The product 2 amperes x 2 volts x 2 seconds is equal to: 8 newtons 8 newton amperes 8 joules 8 coulombs 10. The flow of electricity in a circuit is based on the flow of Electrons Nuclei Atoms Neutrons 11. Which of the following IS NOT a typical indication of an overload condition? Flashing LIghts The display shows 0 "E" for error "OL" for overload 12. What causes the nucleus of an atom to be positively charged? Neutrons Positrons Protons Electrons 13. Current in a series circuit Decreases at different points Increases at different points Is the same at all points Varies 14. Car batteries are often rated in ampere-hours. This reflects the amount of _________ that can be drawn from the battery. power charge voltage current 15. The figure below shows five incomplete circuits composed of resistors, R, all of equal resistance, and capacitors, C, all of equal capacitance. A battery that can be used to complete any of the circuits is available.Into which circuit should the battery be connected to obtain the greatest steady power dissipation? A C E B D 16. A lamp, a voltmeter V, an ammeter A, and a battery with zero internal resistance are connected as shown below. Connecting another lamp in parallel with the first lamp as shown by the dashed lines would: increase the ammeter reading decrease the voltmeter reading decrease the ammeter reading increase the voltmeter reading 17. The voltage is 250 V and the current is 8.0 mA. The power dissipated by the potentiometer is 2.0 mW 31 mW 2.0 W 31 W 18. A 500 W heater carries a current of 4.0 A. How much does it cost to operate the heater for 30 min if electrical energy costs 6 cents per kW‑hr? 9.0 cents 3.0 cents 6.0 cents 1.5 cents 19. In the circuit below, the voltmeter V draws negligible current and the internal resistance of the batter is 1.0 ohm. The reading of the voltmeter is? 10.0 V 12.0 V 11.4 V 10.8 V 20. What is the P.D of each resistor? 24A,48A 4V,8V 24V,48V 4A,8A 21. What would be the expected output component for a radio receiver? Volume control Tuning knob Antenna Speaker 22. What would cause a component to drop the applied voltage? An open A decrease in value An increase in Value A Short 23. What is the total current of the circuit? 11.0A 12.0A 0A 6.0A 24. What happens to current when voltage increases? Decreases Remains the Same Who Cares Increases 25. In a 30 minute interval, one kilowatt-hour of electrical energy is dissipated in a resistance of 20 ohms by a current of 18 A 14.1 A 10 A 20 A 1 out of 25 Time is Up! Time's up
