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concepts_ch4

# 10 v conceptest 45a conceptest more circuits i what

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Unformatted text preview: epTest More Circuits I What happens to the voltage What a) increase increase across the resistor R1 when the b) decrease decrease switch is closed? The voltage will: switch c) stay the same stay R1 S V R3 R2 ConcepTest 4.5a ConcepTest More Circuits I What happens to the voltage What a) increase increase across the resistor R1 when the b) decrease decrease switch is closed? The voltage will: switch c) stay the same stay R1 With the switch closed, the addition of R2 to R3 decreases the equivalent resistance, so the current from the resistance battery increases. This will cause an battery S V increase in the voltage across R1 . Follow-up: What happens to the current through R3? R3 R2 ConcepTest 4.5b ConcepTest More Circuits II What happens to the voltage What a) increases increases across the resistor R4 when the b) decreases decreases switch is closed? switch c) stays the same stays R1 S V R3 R2 R4 ConcepTest 4.5b More Circuits II What happens to the voltage a) increases increases across the resistor R4 when the b) decreases decreases switch is closed? switch c) stays the same stays We just saw that closing the switch causes an increase in the voltage across R1 (which is VAB). The voltage of the battery is constant, constant so if VAB increases, then VBC must decrease! decrease A R1 B S V R3 R2 C Follow-up: What happens to the current through R4? R4 ConcepTest 4.6 Even More Circuits ConcepTest a) R1 Which resistor has the Which greatest current going b) both R1 and R2 equally through it? Assume that all c) R3 and R4 the resistors are equal. the d) R5 e) all the same R1 V R2 R4 R3 R5 ConcepTest 4.6 Even More Circuits ConcepTest a) R1 Which resistor has the Which greatest current going b) both R1 and R2 equally through it? Assume that all c) R3 and R4 the resistors are equal. the d) R5 e) all the same The same current must flow through left and right combinations of resistors. On the LEFT, the current splits equally, so I1 = I2. On the RIGHT, more current will go through R5...
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