I'm doing coursework on resistance and i've done all of the experiments and what not but i'm stuck on what to put on the introduction as we have to put some background information on resistance and how it works ect.
I've put a basic description of what resistance is and the formula for it but I need some more information.
Why does the Voltage divided by the current equal the resistance?
What does resistance effect in real life?
I need to know things like that.
2006-11-29 08:43:28 · 4 answers · asked by claireybearyfairy 4 in Science & Mathematics ➔ Physics
The entire reason that every house and business and car/truck has breaker boxes is because of resistance. Current flowing where it shouldn't, and causes somehting to heat up is because of resistance!
Computers....same thing. Most circuit boards have relayes that will 'trip' if a short occurs, and usually this results in things getting overheated.......because of resistance.
Resistance is like friction for electrons. If you rub two sticks together they get hot (resistance)....same for electrons flowing thru a wire. The electrons 'bump' into various things as they go, and it gives rise to heat to put it simply.
Toasters rely on resistance to work. Ever look inside when one is on? Ever see the glowing wires in there?.....resistance causes the wires to heat and get red hot! This is what 'cooks' your toast.
Same for an electric oven.......electric heating in your home.
Does this help?
Good luck to you!
:)
2006-11-29 08:51:47 · answer #1 · answered by Anonymous · 1⤊ 1⤋
Electrical resistance exacts a voltage drop as the price for allowing electrical current to flow through the resistance. The use of the term resistance implies that the current flow will be in phase with the voltage across the resistor and that the current flow will be proportional to the voltage drop. These conditions are Ohm's Law. There are devices which do not meet these conditions. They can be useful, but they should be considered as another component class such as thermistors etc. Mathematically V = I x R, where V is the instantaneous voltage across the resistance, I is the instantaneous current through the resistance, and R is a constant specific for the resistance. If V is in Volts and I is in Amperes, then R will be in Ohms. Practical resistors vary modestly with temperature, but change very little with voltage or current, except as these change the temperature. A resistor should be the same for flow in either direction and for DC and AC of modest frequency. At high frequencies resistors can display inductance and/or capacitance. Resistors can be purchased with various resistance tolerances, with various temperature sensitivities, and with various power ratings. Running at full power rating may shorten life and may produce temperatures which affect adjacent components. Derating to 1/2 or even 1/3 power may be wise.
2016-03-29 16:10:18 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Ohm's Law states that R = V/I. No one here can prove that law to you. It's too hard.
In real life, resistance is used to counteract voltage. Another way of thinking about the units Ω (ohms) is thinking of them as -V (negative volts). You will understand this more when you learn Kirchoff's rules.
2006-11-29 09:10:50 · answer #3 · answered by عبد الله (ドラゴン) 5 · 0⤊ 1⤋
Why don't you search Google and http://www.wikipedia.org and http://scholar.google.com
2006-11-29 08:52:26 · answer #4 · answered by Anonymous · 0⤊ 3⤋