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Electronics help?

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garygnu

Registered User
I am having trouble with the astb prep test questions regarding electronics. On #9 I am guessing that the direction of the current is moving counterclockwise based on the arrow of the voltage source. On #10 I would assume that the voltage drop is greatest across Rx because the resistance is greatest at this resistor. However on #11 I quessed wrong. I thought that the current is greater at B because the current has not hit any resistance after coming through the voltage source. However for some reason I am wrong. Could someone please explain these three questions for me? Thanks.
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ALso if anyone can explain #18 regarding hydraulics, I would be very thankful.
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froghead1

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You are right on the first two, but on the last one, the voltage is what changes. The current remains the same all the way throught the series circuit.
 
ea6bflyr

ea6bflyr

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Using Ohm's Law (V=I*R), you can do the math and figure out the Voltage (V) drop across each resistor (R). Like Froghead said, current (I) is a constant in a series circuit and voltage can be summed up and should equal the total voltage from the voltage source.
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