- What is a specific resistance?
- What is the relationship between current and resistance?
- What does increased resistance mean?
- Why does current increase when resistance is increased in parallel?
- What is the function of resistance?
- What happens to voltage when resistance decreases?
- Does temperature affect resistance?
- Does diameter affect resistance?
- What happens to current when load increases?
- Does current affect resistance?
- Is voltage directly proportional to resistance?
- Does voltage increase when resistance increases?
- Is resistance directly proportional to temperature?
- Does less resistance mean more voltage?
- Is current inversely proportional to resistance?
- Why does voltage decrease when current increases?
- Why does resistance increase with current?
- How do I calculate resistance?
- Why resistance decreases with increase in area?
What is a specific resistance?
Specific resistance is defined as the resistance offered per unit length and unit cross-sectional area when a known amount of voltage is applied..
What is the relationship between current and resistance?
The relationship between current, voltage and resistance is expressed by Ohm’s Law. This states that the current flowing in a circuit is directly proportional to the applied voltage and inversely proportional to the resistance of the circuit, provided the temperature remains constant.
What does increased 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.
Why does current increase when resistance is increased in parallel?
As more and more resistors are added in parallel to a circuit, the equivalent resistance of the circuit decreases and the total current of the circuit increases. Adding more resistors in parallel is equivalent to providing more branches through which charge can flow. … The current at Y is greater than the current at Q.
What is the function of resistance?
A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses.
What happens to voltage when resistance decreases?
You will see that the voltage drop across the lower resistance is 1 v and the drop across the 900ohm resistor is 9v. So if you increase the resistance of the component, the voltage drop across it will increase. This will only happen in a series connected circuit. The voltage of the battery will not increase.
Does temperature affect resistance?
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.
Does diameter affect resistance?
As the diameter of the wire increases, the resistance decreases. In fact, if we double the cross-sectional area then the resistance halves. This means that resistance is inversely proportional to the area of the wire.
What happens to current when load increases?
When the loading on the motor is increased, the slip of the motor increase. The rotor induced voltage increase due to increase in the slip. The rotor current increase due to increase in rotor voltage with an increase in the slip. Thus, the motor current increase when motor load increases.
Does current affect resistance?
Ohm’s law states that the electrical current (I) flowing in an circuit is proportional to the voltage (V) and inversely proportional to the resistance (R). Therefore, if the voltage is increased, the current will increase provided the resistance of the circuit does not change.
Is voltage directly proportional to resistance?
In the first version of the formula, I = V/R, Ohm’s Law tells us that the electrical current in a circuit can be calculated by dividing the voltage by the resistance. In other words, the current is directly proportional to the voltage and inversely proportional to the resistance.
Does voltage increase when resistance increases?
This equation, i = v/r, tells us that the current, i, flowing through a circuit is directly proportional to the voltage, v, and inversely proportional to the resistance, r. In other words, if we increase the voltage, then the current will increase. But, if we increase the resistance, then the current will decrease.
Is resistance directly proportional to temperature?
If the temperature of a metal conductor increases, the ions of the metal vibrate more vigorously. This increases the number of collisions between the free electrons and the ions. Hence, for a metal, resistance increases with increasing temperature. Often the increase in temperature is caused by an increase in current.
Does less resistance mean more voltage?
“According to Ohm’s law, resistance varies directly with voltage. This means that if resistance increases voltage increases”
Is current inversely proportional to resistance?
Current is inversely proportional to the resistance. A threefold increase in the resistance would cause a threefold decrease in the current.
Why does voltage decrease when current increases?
when a Transformer is loaded, as the load current increases, there will be increase in drop, in the internal resistance of the transformer coil. Therefore the voltage drops down.
Why does resistance increase with current?
An electric current flows when electrons move through a conductor, such as a metal wire. The moving electrons can collide with the ions in the metal. This makes it more difficult for the current to flow, and causes resistance. … The relationship between resistance and wire length is proportional .
How do I calculate resistance?
If you know the total current and the voltage across the whole circuit, you can find the total resistance using Ohm’s Law: R = V / I. For example, a parallel circuit has a voltage of 9 volts and total current of 3 amps. The total resistance RT = 9 volts / 3 amps = 3 Ω.
Why resistance decreases with increase in area?
when cross section increase, surface area of wire increase. More surface area leads to free flow of electrons. so electron flow easily and resistance decrease. … Hence resistance decreases.