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15
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What is the electric current
Electric current is the flow of electric charges (usually electrons) through a conductor such as a wire.
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15
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Increasing resistance increases current. True or False
False
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Definition of Joule-Lenz Law
ยซhat electric current produces heat by passing through a conductor
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Symbol and Unit of electric current
Symbol is I; Unit is A
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thief
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seesaw
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gift
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thief
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15
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If the cross-sectional area is doubled, what happens to resistance?
Resistance decreases
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20
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Three resistors 2 ฮฉ, 3 ฮฉ, and 5 ฮฉ are connected in series. a) Find total resistance b) Find current if U = 10 V
1) 10ฮฉ; 2)1A
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trap
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shark
Other team loses 15 points!
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fairy
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baam
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What charge does pass through 0.5 Ampere lamp in 200 seconds?
100 C
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Why is a parallel connection is used in houses? Why is a series connection not used in houses?
Parallel: If one bulb burns out, the rest keep working.; Series:If one device breaks, the circuit opens โ all devices turn off
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20
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A 12 ฮฉ and 4 ฮฉ resistor are connected in parallel to 12 V. a) Total resistance b) Total current
1)R=3 ฮฉ; 2) I=4A
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ยซA resistance of a conductor depends on factors:
length, cross-sectional area (thickness) and type of material; Temperature
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seesaw
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star
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gift
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banana
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Properties of parallel combinations
1.U=U1=U2; 2. I=I1+I2; 3. 1/R=1/R1+1/R2
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seesaw
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fairy
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gift
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banana
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15
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Electron flow is in the _________ direction to the flow of current.
opposite
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