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6. The watt-hour is a unit of IUS - FENS - EE - Fall 2014 ENS203 Electrical Circuits Quiz 2 (27.Oct.2014) Time allowed - 15 minuets (extra 10 minutes for coming early) Name: ID: (A) (a) (b) (c) (d) There are 9 Multiple choice questions, 3 ll in the blank, and two essay problems 7. According to Ohm's law, which of the following is directly proportional to voltage if resistance is kept constant? 1. If a variable voltage source is set to 12 volts, to what voltage must it be adjusted to decrease the circuit's current by 25% (a) (b) (c) (d) (a) (b) (c) (d) Increase it to 16 V Increase it to 20 V Decrease it to 9 V Decrease it to 6 V Current Frequency Reactance Electromotive force 8. Practical systems have an eciency 2. A certain resistor with color code of (Red/Red/Red/Gold). If the resistor was connected across the terminals of 12 volts battery, The nominal current owing through the resistor is: (a) (b) (c) (d) energy power eciency amount of money (a) (b) (c) (d) 5.19 mA 5.45 mA 5.74 mA 6.0 mA positive and equal to100% z negative and less than 100% positive and less than 100% positive and more than 100% 9. With no external forces applied, the net ow of charge in a conductor in any one direction is (a) (b) (c) (d) 3. Which one of these statements is true of the ohmmeter? negative positive maximum zero (a) It is used to measure resistance of a single resistor in a network without removing the resistor II Fill in the blanks from the circuit (b) It is used to measure resistance in a circuit on;y 1. A solar cell with an eciency of 12% drives a small of the circuit is powered by low-voltage batteries motor of an eciency of 85%. The total eciency is: ............................... (c) It should be stored with the selector switch in the resistance mode 2. One kilowatt-hour is equivalent to .......................... (d) It displays a resistance of zero if the leads touch joules each other, and an innite reading if there is no 3. The power dissipated by a resistor connection at all. ...................................... if the applied voltage 4. If an electrical circuit draws 1A at 50V, how much doubles. (how much the decrease or the increase) current will it draw if the voltage is increased to 75 V? III What is the name of the author of our text (a) (b) (c) (d) book? 1.5 A 15 mA IV For the circuit shown, identify which elements are giving power and which elements are absorbing and how much is that power 15µA 1.5 mA 5. A power supply provides a continuous 200 W to a load, with an eciency of 80%. In 24-hour period how many KWh of energy does it consume? (a) (b) (c) (d) 6 KWh 250 KWh 600 KWh 4.8 KWh? 1