How does length of wire affect resistance?
How does length of wire affect resistance?
First, the total length of the wires will affect the amount of resistance. The longer the wire, the more resistance that there will be. More collisions mean more resistance. Second, the cross-sectional area of the wires will affect the amount of resistance.
What does high resistance mean?
Resistance measurements are normally taken to indicate the condition of a component or a circuit. The higher the resistance, the lower the current flow. If abnormally high, one possible cause (among many) could be damaged conductors due to burning or corrosion.
How does temperature affect resistance in a wire?
Heating a metal conductor makes it more difficult for electricity to flow through it. These collisions cause resistance and generate heat. Heating the metal conductor causes atoms to vibrate more, which in turn makes it more difficult for the electrons to flow, increasing resistance.
What two factors determine an object’s speed?
Chapter 19 – Motion
| Question | Answer |
|---|---|
| What two factors determine speed? | distance & time |
| What is the difference between speed and velocity? | Velocity has direction speed does not. |
| What best represents acceleration as presented on a graph? | velocity change vs. time |
| What is force? | a push or pull acting on an object. |
Does resistance change over time?
Resistance also depends on temperature, usually increasing as the temperature increases. For reasonably small changes in temperature, the change in resistivity, and therefore the change in resistance, is proportional to the temperature change.
How resistance is directly proportional to length?
The resistance of a wire is directly proportional to its length and inversely proportional to its cross-sectional area. The resistance of a conductor, or circuit element, generally increases with increasing temperature.
What happened to the current in the series circuit if the resistance is doubled?
if you increase the resistance (the opposition to current flow) in a circuit then the current flow will decrease in direct proportion, eg if the resistance in a circuit doubles then current flow will halve.
What is the effect on the current in a wire if both the voltage and resistance are doubled?
What is the effect on the current in a wire if both the voltage across it and its resistance are doubled? The current is doubled. The current is halved.