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 . Followup: 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 Followup: 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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 Spring '11
 Young
 Physics, Electrical resistance, Series and parallel circuits, Wheatstone, ConcepTest

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