Question

eold and silver are replaced with yellow and grly Part Five: Circuit Analysis 5.3 Extension 8: Voltages and Current 1. Three resistors, 20 Ω,40 Ω, and 80 Ω are connected in series with a 9.0 v Color-code and construct an electric potential diagram. battery. /2,)Three resistors, 20 Ω, 40 Ω, and 80 Ω are connected in series with a 90V Dileer batery a) Which resistor will have the greatest voltage across it? b) Which resistor, if any, will have the greatest current through it? your answers. Explain c) Compute the voltage across each resistor. 3. A hand-cranked generator is designed to produce a constant current when its handle is tumed at a constant speed. The voltage across a 50 Ω resistor attached to the generator is measured to be 3.57 volts. What current is flowing through the resistor? Through the generator? 4. A hand-cranked generator is designed to produce a constant current when its handle is turned at a constant speed. The voltage across a 20 Ω resistor attached to the generator is measured to be 2.6 volts. What current is flowing through the resistor? Through the generat 5. Measurements in the circuit on the right showed that the voltmeter reading across the 20 2 resistor is zero and an ammeter inserted into the 150 circuit reads zero. All readings were made with the switch open. Find Δν across each of the 3v D 20Ω following devices, and tmen color-code the circuit. Tu a) 152 resistor b) 5 Ω resistor c) the switch 2 d) the battery Module 9: Electric Circuits 115

Answer 1

Color code for 20 Ohm rightarrow red black black gold color code for 40 Ohm yellow black black gold color code for 80 Ohm gray black black gold (a) As V R. So greater the resistance greater the P voltage. so (80 Ohm) will have largest potential (b) They are in series. so current flowing through resistors will be same. (c) I (Total current) = V/R_1 + R_2 + R_3 = 9/20 + 40 + 80 = 0.06428 so voltage across 20 Ohm = 0.06428 times 20 = 1.2857 V Voltage across 40 Ohm = 0.06428 times 40 = 2.5712 V Voltage across 80 Ohm = 0.06428 times 80 = 5.14 V \r\n here current I = V/R = 3.57/50 = 0.0714 A Current flowing is 0.0714A I = 2.6/20 = 0.13A Therefore So current flowing is 0.13A (a) 15 Ohm resistor rightarrow Brown green Black Black Total current I = 3/15 + 120 + 5 = 3/40