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.
What happens to the reading in the ammeter?
An ammeter is an instrument which is used to measure Current and when current increases its obvious that the reading of an
ammeter will increase
. In other words, the scale of the ammeter will go upscale.
How do you increase ammeter reading?
To increase the current the ammeter can measure,
it can be placed in parallel with a resistor, known as a shunt resistor
, as shown in the figure below.
Why the ammeter reading decreases to one half when the length of the wire is doubled?
Detailed Solution. At a given temperature, the resistance (R) of a conductor depends on its length (L), area of cross-section (A) and the material it is made of. If the length of the wire is
doubled then the resistance of the wire will also double
. Hence, the Current will decrease to one half.
What happens to the ammeter reading and what happens to the brightness of the lamp?
| Ammeter reading Lamp brightness | B Decreases Increases | C Increases Decreases | D. Increases Increases |
|---|
What is the reading of ammeter as shown in the circuit diagram?
Hint: An ammeter is an instrument that is commonly used to measure the current in a given circuit. The reading shown by the ammeter is
always the same reading that the total amount of current is passing through that segment
.
What law does V IR represent?
Alternate statements of
Ohm’s law
are that the current I in a conductor equals the potential difference V across the conductor divided by the resistance of the conductor, or simply I = V/R, and that the potential difference across a conductor equals the product of the current in the conductor and its resistance, V = IR …
How can we reduce ammeter reading?
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.
Does voltage decrease with resistance?
The current is directly proportional to the voltage and
inversely proportional to the resistance
. This means that increasing the voltage will cause the current to increase, while increasing the resistance will cause the current to decrease.
What is a very sensitive ammeter called?
Picoammeter
.
A picoammeter, or pico ammeter
, measures very low electric current, usually from the picoampere range at the lower end to the milliampere range at the upper end. Picoammeters are used where the current being measured is below the limits of sensitivity of other devices, such as multimeters.
What happens to ammeter reading when the length of 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 happen to the reading of ammeter If we increase the length of manganin wire?
The
decreases
.
In a series electrical circuit comprising a resistor made up of a matallic wire, the ammeter reads `5 A`. The reading of the ammeter decreases to half when the length of the wire is doubled.
What happens to the current when the length of wire is doubled?
Complete answer:
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 the ammeter reading as more lamps are added?
As the
number of bulbs in series increases
, both the ammeter reading and bulb brightness should decrease. Using standard ammeters may not give perfect results and if the bulbs are allowed to heat up too much in between adding more bulbs, their resistance will be higher.
What will be the reading on the ammeter if the bulbs are identical?
The reading will be
double the previous value
.
What will happen to all the ammeter reading if bulb B 1 is blown away?
When the three bulbs are working good and glowing, the current recorded in ammeter A is 6 ampere. Answer the following questions. … c) what will happen to all the ammeter reading if bulb B1 is blown away. d)
the current shown in ammeter A remains even any bulb goes down.
