Question

The voltage in series is equal?

Answer 1

I mean is it:

vt=v1=v2

or

vt=v1+v2

?

Answer 2

V_battery= V_resistor1 + V_resistor2 + ... + V_resistor3. This is one of the Kirchhoff's rules. It says that the algebraic sum of all the voltage drops in a given closed loop are equal to the algebraic sum of all the voltage sources.

Answer 3

... all the voltage sources in that closed loop.

Answer 4

Okay, so it's the second one right?

Answer 5

vt=v1+v2 ?

Answer 6

Yes it's the second one! Thank you verryyyy much :D

Answer 7

ok, np

Answer 8

Wait, can you take a look at this question: ( PLEASE )

A current of 0.5 A passes through a 10 ohm resistor R1 connected in series to a resistor R2. The voltage across the first
resistor is 12V. What is the current in the first resistor? In the second resistor? How much is the voltage across the
second resistor? How much is the voltage across the combination?



The voltage across one resistor is 10 volts. The voltage across another resistor connected in series with the first is
12 volts. Find the potential difference across the combination

Answer 9

is R1 the first resistor? It doesn't make any sense...

Answer 10

This is what I got :

The current in the first and the second resistor is 0.5 A
( because the current in series is the same for the whole circuit )

How do you find the voltage across the second resistor?

Answer 11

Yes R1 is the first resistor :)

Answer 12

Maybe if you draw a circuit with resistors.. it might help you figure it out :)

Answer 13

It says "The voltage across the first resistor is 12V" but it can't be. Voltage across a resistor is \[U_{R1} = I*R_1\] and since you know the current passing (0.5A) and the resistance (10ohm) the voltage across R_1 is 10*0.5= 5V

Answer 14

Yes, draw it and write the exact question from the textbook or where ever..

Answer 15

Why it can't be?

Answer 16

There is no drawing or anything...

Answer 17

Because the voltage drop over a resistor is defined by the Ohm's law:\[U=I*R\]

Answer 18

Here is the link if you want : ( question number 4 )

http://207.67.101.76/amsamman/AMS%20files/Sample%20Questions/Grade%208/Science/SQ%201112_19914-J_S%20_AMS_SQ.doc.pdf

Answer 19

What does U represent ?

Answer 20

ah sorry, In Croatia we use U for V so it's :
\[V=I*R\]

Answer 21

Oh okay!

Answer 22

well, this question makes no sense, unless there was a change, because in the first sentence the voltage across R1 was 5 V (you get that using Ohm's law), and in the next sentence it is stated that the voltage across R1 is 12V.