29/03/2020 D.C Circuits(Senior Class Physics Study by Topics) 0Comments by Gate Academy Welcome to your D.C Circuits(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. If you replace a wire resistor with another of the same material and length but with three times the diameter, the resistance is now:3 times that of the original resistor1/9 that of the original resistor9 times that of the original resistor1/3 that of the original resistor2. Suppose that a circuit has 472 Ω of resistance and the current is 875 mA. Then the source voltage is1.85 VNone of the above413 V0.539 V3. 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 voltmeter readingdecrease the ammeter readingdecrease the voltmeter readingincrease the ammeter reading4. Complex circuits can be simplified using one of ___________ lawsNewton'sKirchoff'sFranklin'sFaraday's5. The basic measurement of resistance isOhmAmpWattVolt6. What would be the expected output component for a radio receiver? Volume controlSpeakerAntennaTuning knob7. You have an unlimited supply of 1-W, 1000-Ω resistors, and you need a 500-Ω resistance rated at 7 W or more. This can be done by assembling A 3 X 3 series-parallel matrix of 1000-Ω resistorsSomething other than any of the aboveFour sets of two 1000-Ω resistors in parallel, and connecting these four sets in seriesFour sets of two 1000-Ω resistors in series, and connecting these four sets in parallel8. Four resistors are connected in series, each with a value of 4.0 KΩ. The total resistance is4 KΩ8 KΩ1 KΩ16 KΩ9. Specific resistance of a wire can be written asR/LA/RLRL/ARA/L10. What effect on total curret flow will a shorted series component have in a series-paralle circuit? Total current will increaseThere will be no effectTotal current will stopTotal current will decrease11. Convert 10000 to metric prefix10 Mega10 Kilo100 Mega100 Kilo12. The voltage is 250 V and the current is 8.0 mA. The power dissipated by the potentiometer is2.0 W2.0 mW31 W31 mW13. According to Ohm's law: I=P*EE=I*RR=E*IE=I/R14. 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.Which circuit will retain stored energy if the battery is connected to it and then disconnected?DACEB15. Suppose you have three resistors in parallel, each with a value of 68,000 Ω. Then the total resistance is 204 Ω23 KΩ0.2 MΩ23 Ω16. The unit of electric current, the ampere, is dimensionally equivalent to which one of the following?volt^2∙ohmvolt∙wattwatt/voltvolt /ampere17. Ten Coulombs of charge start from the negative terminal of a battery, flow through the battery and then leave the positive terminal through a wire, flow through a resistor and then return to the starting point on this closed circuit. In this complete process, the ten coulombshave no net change in electrical potential energyreceive heat energy from the resistorhave a net loss of electrical potential energydo positive work on the battery18. Good engineering practice usually requires that a series-parallel resistive network be made:From a parallel combination of resistors in seriesFrom resistors that are all the sameFrom resistors that are all very ruggedFrom a series combination of resistors in parallel19. A source delivers 12 V and the current is 777 mA. Then the best expression for the resistance is9.3 Ω15.4 Ω9.32 Ω15 Ω20. The rated emf (voltage) of a battery is 12 volts. When the battery delivers a current of 0.5 A to a load, the potential difference between the terminals of the battery is 10 V. The internal resistance of the battery is1 ohm2 ohms1/2 ohm4 ohms21. There is a circuit with an emf source of 6.0V connected to a lamp and a current flow of 2.0A. Assuming that the wires connecting the whole circuit is resistance free, what is the resistence of the lamp?6.0Ω3.0Ω2.0Ω0Ω22. The first step in calculating voltage drops in a series-parallel circuit is to determine ___Total currentTotal voltageThe resistance of the parallel resistorsThe resistance of the series resistors23. In a series circuit the _______________ is always the same ResistanceCurrentPowerVoltage24. Current in a series circuit VariesIncreases at different pointsIs the same at all pointsDecreases at different points25. Burns cause by electrical current flowing through the body tissue and bones are calledThermal Contact BurnsElectrical BurnsShock BurnsArc Burns26 out of 25Time is Up!
