13:09 Done 9 of 9 SPH3U Worksheet Electric Circuits Name Worksheet #3 Date 1. Find the total resistance in each of the following cases. a) A 12 0, 25 0 and 42 0 resistor connected in series. b) Three 30 0 light bulbs and two 20 0 heating elements connected in series. 3 2 bulbs in series. ) Two strings of Christmas tree lights, if the first string has eight 4 42 bulbs in series and the second has twelve 17 n [79 Q, 130 0, 68 92] 2. Find the value of the unknown resistance in each of the following cases. a) A 20 0, an 18 2 and an unknown resistor connected in series to give a total resistance of 64 0. of 150 Q. b) Two identical unknown bulbs connected in series with a 50 2 and a 64 2 heater to produce a total resistance [26 2, 18 22] 3. Find the total resistance in each of the following cases. a) A 16 2 and an 18 9 resistor connected in parallel. [8.5 2] b) A 20 0, 10 Q and a 5 2 resistor connected in parallel. [2.9 2] 4. Calculate the total resistance of two, three, four and five 60 ^ resistors in parallel. What is the simple relationship for the total resistance of equal resistances in parallel. da [30 92, 20 92, 15 92, 12 02] 5. Find the total resistance from A to B for each of the following circuits: es 00 a) 15 Q AC b) WWW AC 25 9 WWW 20 9 20 2 BO 50 Q C) d) 0 9 AO A -60 Q WWW 60 Q 60 Q B B f) el 45 S 10 9 20 0 AO 20 Q WWW 60 S 30 0 -20 Q 20 Q BO B 20 0 [90 0, 10 0, 15 0, 40 02, 20 0, 30 Q] + 3