Circuits Review Sheet 1) You have a box full of 50 0. Use these to create the equivalent of a 25 2 circuit, a 75 2 circuit, a 33.33 2 circuit, a 125 2 circuit, and a 10 2 circuit. DRAW THE CIRCUITS BELOW. You should have 5 separate circuits drawn. 2) You have a 40 W light bulb and a 60 W light bulb. The power rating on the bulbs assumes they bulbs are used in your home. .. which is wired in parallel. Which one will be brighter if you put them in parallel? Which one will be brighter if you put them in series? Explain. If they are each connected to a 120 V source, what is the resistance of each bulb? Do your answers to the previous question support your explanation as to why a particular bulb would be brighter? 3) What is the resistance of the unknown resistor below if the current coming out of the source is 1A? 66.670, 580 100 V 100 V ??? 9 50 9 50 9 ??? Q 25 92 100 0 100 0 50 Q 100 0 Page 1 / 3 +4) Find the equivalent resistance for each. All resistors have a value of 102. 2.2352 3,65 52 2 3 ) 0.33525) Find the current and voltage across each resistor. Remember to use e chart to keep you organized. 23 51?. SEE #0}: 7) For each of the following, write the form of circuit that applies: SERIES OR PARALLEL. a) The current is the same everywhere throughout the entire circuit. b) The total resistance is equal to the sum of the individual resistances. c) The voltage drop across each resistor in the circuit is the same. d) The voltage drop across each resistor is proportional to the resistance. e) Adding a resistor to the circuit decreases the total resistance. f) Adding a resistor to the circuit increases the total resistance. g) If the current through one resistor in the circuit goes to zero, there is no current in the entire circuit. h) If the current though one resistor in the circuit goes to zero, the current through all other resistors remains the same. i) This form is suitable for house wiring. ANSWERS TO CIRCUITS ON PREVIOUS PAGE RESISTANCE VOLTAGE CURRENT POWER 5 22.6 4.52 102.15 27.12 2.71 73.55 27.12 1.81 49.03 20 50.17 2.51 125.85 25 50.17 2.01 100.68 RESISTANCE VOLTAGE CURRENT OWER 10 9.14 0.92 8.41 20 9.14 0.46 4.2 30 2.4 0.08 0.19 40 2.4 0.06 0,14 50 7 0.14 D.98 60 90.6 1.51 156.8 RESISTANCE VOLTAGE CURRENT POWER 5 3.34 0.67 2.2 10 3.34 0.33 1.1 20 1.34 0.067 0.09 30 2.01 0.067 0.13 40 42.8 .07 45.8 50 53.5 -07 57.25 8) Using the second circuit in Problem #5, answer the following questions. What would happen to the brightness of the other bulbs/resistors if a) We remove the 100 resistor b) We remove the 2092 resistor c) We remove the 300 resistor d) We remove the 409 resistor ) We remove the 500 resistor f) We remove the 600 resistor 9) A piece of wire made of Iron (9.71x1080m) is 0.15 meters long and goes from a 120V source to a 20042 resistor. From the other side of the resistor is a 0.5 meter long wire made of Nichrome (100x10802m) which goes back to the 120V source. Both wires have a radius of 8x10* meters. a) What is the current flowing through this circuit? 0.532A 10) For the first circuit in question 5, how many electrons flow through the 50 resistor every hour? 1.02x10He's