1: Suppose you have 10 light bulbs each of 100 Watt at your home. All of them are used for 6 hours every day. If the billing rate is 9 cent per unit (kilowatt-hr), how much do you have to pay in a month for those 10 bulbs?  2: An energy saving light bulb is saying that it would glow like a 60 watt bulb but its actual power consumption is 25 watts. If this light is turned on for 5 hours a day, how much is the saving in a year (consider billing rate is 10 cent per kilowatt-hr)?

If a lamp has resistance of 120 W when it operates at 100 W, what is the applied voltage?  a. 110 V b. 120 V c. 125 V d. 220 V

Question 1 Jonathan connected a bulb of unknown resistance to a 3.7 V battery and measured a current of 1.23 A flowing through the bulb.              First Electric Circuit                        I = 1.23 A    Then, he changed the power source to a 5 V battery and connected it to the same bulb.              Second Electric Circuit                         I = ?   What current flowing through the bulb can Jonathan claim for his second electric circuit?     A 0.60 amps      B 1.66 amps      C 15.00 amps      D 15.15 amps

A battery is connected to three resistances 5 ohm, 4 ohm & 3 ohm which are connected in series.  a. Find the effective resistance of the circuit? b. Suppose 5 ohm resistor has a voltage of 12 V across it. What is the value of current through each of the resistors? c. What is the value of the battery voltage?