What happened to the ammeter reading when the length of the wire is doubled?
When the length of the wire is doubled, then the ammeter reading decreases to half its previous value i.e., current through the wire is halved.
What will be the reading in the ammeter and the voltmeter if the length of the resistor is doubled?
It is observed that the ammeter reading decreases to one-half when the length of the wire is doubled.
What happens to the current when the length of wire is doubled?
So, the new resistance, after doubling the length of the wire, becomes twice of the original resistance. Hence, if the length of a wire is doubled, then its resistance becomes doubled.
What happens to resistance and resistivity when length is doubled?
(d) Resistivity of wire remains constant. As the length of wire gets doubled, the cross-sectional area will become half of its previous value because volume of wire remains constant. Hence, we can see that the new resistance is four times the previous resistance.
Why does the ammeter reading decreases?
The ammeter gives the value of current flowing in the whole circuit since the components are connected in series. For the current in the circuit (ammeter reading) to decrease, the total resistance in the circuit should increase. The resistance of the fixed resistor on the left cannot be increased.
When wire is doubled What is the diameter?
The resistance of the wire becomes one-fourth, when the diameter of the wire is doubled. Hence, the correct option is \( \left(d\right)\).
What is unit of resistivity?
Resistivity, commonly symbolized by the Greek letter rho, ρ, is quantitatively equal to the resistance R of a specimen such as a wire, multiplied by its cross-sectional area A, and divided by its length l; ρ = RA/l. Thus, in the metre-kilogram-second system, the unit of resistivity is ohm-metre.
What happens to resistance when you increase the length of a wire?
The resistance of a long wire is greater than the resistance of a short wire because electrons collide with more ions as they pass through. The relationship between resistance and wire length is proportional . The relationship between resistance and the area of the cross section of a wire is inversely proportional .
What happens to the resistance when the length of the conductor is doubled?
As the length of the conductor gets doubled, the resistance of the conductor also increases. Hence, almost the new resistance of the conductor increases by 4 times.
How are wires affected by Ohm’s law and resistance?
Ohm’s Law and resistance 1 material, eg copper, has lower resistance than steel 2 length – longer wires have greater resistance 3 thickness – smaller diameter wires have greater resistance 4 temperature – heating a wire increases its resistance
When the length of a wire is doubled, what happens to the current?
Assuming the voltage remains constant, when the length of wire is doubled, the resistance of the wire in the circuit also doubles. This reduces the current by one half. However, there is no mention of a circuit load (resistance) in your question, just a wire length, so there are many elaborate answers that may surface here.
How is the resistance of a conductor related to the current?
According to Ohm’s law, the current flow in a conductor is inversely proportional to resistance. i.e ., when the current through the wire increases, the resistance of the conductor decreases and vice versa. So, we can conclude that resistance is proportional to length. Therefore, the current is inversely proportional to length.
How to calculate Ohms Law in a calculator?
Ohm’s Law Calculator Voltage (V) = Current (I) * Resistance (R) Power (P) = Voltage (V) * Current (I) Enter any two known values and press “Calculate” to solve for the others.