Circuits Concept Tests CRKT 1 Vote TRUE A if both statements below are always true Otherwise vote FALSE B BOTH TRUE A or ONE OR BOTH FALSE B For resistors in series the current through each resistor is the same For resistors in parallel the voltage across each resistor is the same CRKT 2 A 1 resistor is placed in parallel with a 10 000 resistor as shown 1 I 10 000 The total equivalent resistance of these two resistor in parallel is closest to A a little less than 1 B a little more than 1 C 5000 D a little less than 10000 E a little more than 10000 CRKT 3 The circuit below consists of a battery attached to two resistors in series Resistor R1 is variable When R1 is decreased the voltage V2 across R2 A increases B decreases C stays the same V1 R1 R2 V2 I1 I2 V CRKT 4Two resistors R1 and R2 are hooked to a battery in parallel R1 is twice as large as R2 How does the current IB from the battery compare to the current I1 though R1 Hint IB I1 I2 IB I B I1 D IB 4I1 R2 B IB 2I1 E None of these I2 A R1 2 R2 I1 V C IB 3I1 CRKT 5 The four light bulbs shown are identical Which circuit puts out more light Hint more power more light V 12 V V 12 V A C They both put out the same amount of light B CRKT 6 In the circuit below what happens to the brightness of bulb 1 when bulb 2 burns out When a bulb burns out its resistance becomes infinite A Bulb 1 gets brighter 2 3 1 V 12 V B Bulb 1 gets dimmer C Its brightness remains the same Hint What happens to the current from the battery when bulb 2 burns out CRKT 7 The three light bulbs A B and C are identical How does the brightness of bulbs B and C together compare with the brightness of bulb A A A Total power in B C power in A C B B Total power in B C power in A V 12 V C Total power in B C power in A CRKT 8 Two glowing light bulbs are in a battery operated circuit Light bulb A has greater resistance than light bulb B Which light bulb is brighter A B C Depends on the circuit B R2 A A B C D or E None of these will work V If you wanted to measure the current through resistor R2 where would you place and ammeter A B C D or E None of these will work C R3 D R1 CRKT 9 If you wanted to measure the current through the battery where in the circuit would you place an ammeter CRKT 10 A circuit with two batteries is shown below The directions of the currents have been chosen guessed as shown Which is the correct current equation for this circuit A I2 I1 I3 B I1 I2 I3 C I3 I1 I2 D None of these I1 R1 V2 I2 R2 V1 Lo op 1 R3 I3 CRKT 11 Which is the correct equation for Loop 1 A V2 I1R1 I2R2 0 B V2 I1R1 I2R2 0 C V2 I1R1 I2R2 0 D V2 I1R1 I2R2 0 E None of these I1 R1 R2 V2 I2 V1 Lo op 1 R3 I3 CRKT 12 What happens to the identical bulbs when the switch is closed A A glows B changes B A glows B stays same C A stays same B changes D A stays same B stays same A switch 12V B 12V CRKT 13 A flashlight requires 2 AA 1 5V batteries and is arranged as shown Notice that the switch is open Which statement is true A The bulb has 1 5 V across it and glows AA 1 5 V 0 AA 1 5 V 0 B The bulb has 3 V across it and glows C The bulb has 3 V across it and is dark D The bulb has 0 V across it and is dark E The bulb has 0 V across it and glows Which statement is true if the switched is closed Which statement is true if the switched is closed and one of the two batteries is reversed CRKT 14 Two light bulbs are in series attached to a battery as shown The bulbs are marked 40W and 60W Which bulb is brighter Hints More power brighter When light bulbs are in series they have the same current Light bulbs are intended to operate at 120V V A both have same brightness 40W 60W B 40W is brighter C 60W is brighter CRKT 15 A capacitor in an RC circuit is initially charged up to a voltage of 10V and is then discharged through an R 10 resistor as shown The switch is closed at time t 0 0 0 1 F I 10 V0 10 V What is the current through the resistor immediately after the switch is closed at time t 0 0 s A 1A B 0 5A C 1 e A 0 37A D None of these What is the time constant for this circuit A 0 01 s B 0 1 s C 1 s D 10 s D None of these What is the current through the resistor at time t 0 2 s A 1A B 0 5A C 1 e A 0 37A D None of these CRKT 16 An RC circuit is shown below Initially the switch is open and the capacitor has no charge At time t 0 the switch is closed What is the voltage across the capacitor immediately after the switch is closed time 0 R 10 R 10 C 0 0 01 0 F V 10 V A Zero B 10 V C 5V D None of these What is the voltage across the resistor on the far right in parallel with the capacitor at time 0 A Zero B 10 V C 5V D None of these What is the initial current through the capacitor immediately after the switch is closed A 1A B zero C 0 5A D None of these A long time after the switch has been closed what is the voltage across the capacitor A 5V B 10 V C zero D None of these Answer A zero Before the switch is closed the charge Q on the capacitor is zero and the voltage across the capacitor V Q C 0 Right after the switch is closed the charge has not had time to build up on the capacitor and the charge and voltage are still zero Answer A zero The capacitor and the resistor on the right are in parallel and therefore have the same voltage drop across them Since the capacitor is acting like a wire there is no voltage drop across it which is the same for the resistor on the right Answer A 1A Initially when the capacitor has zero charge it behaves like a …
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