Recent content by SyNtHeSiS

Oh ok also say you had a circuit with only a +20V battery and one resistor connected in series with it to earth. Why is it that all 20V would be dropped across the resistor, even if R = 10 ohms or if R = 1k ohm?

Why also is it that current is defined as I = V/R all over a circuit? As in why is it that the current where the circuit has no resistance different? e.g. voltage line between 2 resistors and line between Earth and a resistor.

You wouldn't be able to determine I using Ohm's Law right? Since a circuit must contain a resistor to obey Ohm's Law?

Oh thanks. I also want to know if there is only 1 resistor in a circuit, why is it that the total V+ will be dropped across the resistor, even if V=100V, I mean what if that resistor is small and only consumes a bit of V?

Homework Statement Why is it that the output is equal to V+ (when the switch is open) in diagram A, if there is no current flowing? Why is it that A (1/0) is used by convention? I mean the lamp I got at home has a "0" for off and "1" for on, on the switch. This is confusing me...

How would this be possible since if V=0 then I = 0/0 would still be undefined?

Thanks for the explanation. And something which has been bugging me is say you had a circuit with no resistance and you wanted to calculate the current, how would this be possible since: I = V / 0 would be undefined?

No I ment like I understand why current increases, as voltage increases (cause you supplying more energy in a way which makes a stronger current). But I don't see how an increase in voltage leads to an increase in resistance.

In Ohm's law, resistance is directly proportional to voltage, but I want to actually know why voltage increases, as resistance increases.

Homework Statement I want to know that if there is a voltage drop across a resistor, why is it that voltage increases as resistance increases (Ohm's law)? Homework Equations None. The Attempt at a Solution N/A

The question asked to interpret it in terms of area, that's why I didnt use any integration technique e.g. substitution, but instead tried to calculate in terms of half a circle (1/2 * pi * r^2). So is the answer at the back of my book wrong?

Homework Statement Sketch the graph of y = 2|x - 1| - 3|x + 1| + 3x + 1, and hence solve the inequality 2|x - 1| - 3|x + 1| + 3x + 1 < 0 Homework Equations None The Attempt at a Solution (Refer to attachment). I don't know where (or if) I made a mistake, cause when I try...