Practice Test (See related pages) 1 A series circuit is any circuit that provides one common voltage across all components. A) True B) False 2 A parallel circuit is formed when one or more components are connected across a voltage source. A) True B) False 3 A common application of series circuits is typical house wiring to the power line. A) True B) False 4 In a parallel circuit, the branch with the highest resistance always has the least current. A) True B) False 5 When a parallel circuit has two branch currents, one branch must equal the difference between the total circuit current and the other branch. A) True B) False 6 A combination of parallel branches is often called a string. A) True B) False 7 Adding parallel resistances decreases the total equivalent resistance. A) True B) False 8 The reciprocal resistance formula is derived from the fact that total current is equal to the current of any one branch. A) True B) False 9 When there are two parallel resistances and they are not equal, it is usually quicker to calculate the combined resistance by finding their product and dividing that by their sum. A) True B) False 10 The reciprocal of resistance is . 11 The current in an open branch of a parallel circuit is . 12 A device which serves to protect the circuit components and wiring in the event of a short circuit is a . 13 As more branches are added to a parallel circuit total current . 14 The reciprocal of is conductance. 15 The base unit of is the siemens. 16 A short circuit has practically resistance. 17 With power removed from a parallel circuit, an ohmmeter will measure zero ohms across all the branches. 18 The combined equivalent resistance of two unequal resistances connected in parallel can be found by A) the sum divided by product method B) the product divided by sum method C) adding resistance values D) dividing the value of one resistance by two 19 In a parallel circuit, total power equals A) the sum of the individual values of power in each branch B) the power of any one branch C) the total resistance times the total voltage D) the total voltage divided by the total resistance 20 What would happen to the branch currents in a parallel circuit if one of the branches became short-circuited? A) currents would increase slightly B) currents would be maximum C) currents would decrease to zero D) currents would decrease slightly 21 With power removed from a shorted parallel circuit, an ohmmeter will measure what across all branches? A) infinity ohms B) zero ohms C) 150 ohms D) 1000 ohms 22 Any circuit that provides one common voltage across all components is a A) parallel circuit B) series circuit C) a series-parallel circuit D) short circuit 23 An advantage of having only one pair of connecting leads to the source for all the parallel branches is that usually A) more power is dissipated B) less power is dissipated C) more wire is necessary D) less wire is necessary 24 The combined equivalent resistance across the main line in a parallel circuit can be found by using A) Ohm's law B) Kirchhoff's law C) Lenz's rule D) Fourier's analysis 25 Putting more resistance into a parallel circuit A) lowers the equivalent resistance B) raises the equivalent resistance C) increases the applied voltage D) decreases total power
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