Question

The voltage V in volts produced by a battery is a linear function of the i in amperes drawn from it .The opposite of the slope of the line repesents the battery 's effective resistance R in ohms .For a certain battery ,
V=12.0 when i = 10.0 and V=8.4 when i=10.0
a) What is the effective resistance of the battery ?
b) Find the voltage that the battery would producfe when the current is 25.0 amperes
The key for: a=0.4o hm ,b = 2.4 volts

now a)=
\frac{12-8.4}{1.0-10.0} \frac{3.6}{9=0.4ohm
I can't fig b)

Answer 1

V = -0.4i + b
12 = -.4(1) +b
12.4 = b

V = -.4i + 12.4
i = 25, solve for V
V = -.4(25) +12.4
V = 2.4

Answer 2

look like the key is wrong?

Answer 3

what answr a ?

Answer 4

how so?

Answer 5

the key for a is 0.4 ohm

Answer 6

slope is negative, resistance is opposite of slope so positive 0.4

Answer 7

\[\frac{12-8.4}{1.0-10.0}=\frac{3.6}{9}
= 0.4 ohm

Answer 8

match with the key for a , but b can match 2.4