Question

9. Definition - Power of accommodation, Elect
10. Difference between Voltmeter & Ammeter.
11 Richt hand thumble​

Answer 1

Answer:

power of accomodation:

the ability of eye lens to adjust its focal length is called accomodation.

the focal length cannot be decreased below a certain minimum limit.

this minimum limit is called power of accomodation.

voltmeter & ammeter:

A voltmeter is an instrument used for measuring electrical potential difference between two points in an electric circuit. ... A voltmeter is connected in parallel with a device to measure its voltage, while an ammeter is connected in series with a device to measure its current.

Right hand thumb rule:

stretch the thumb forefinger and middle finger of right hand so that they are perpendicular to each other. if the forefinger indicates the direction of the magnetic field and the thumb shoes the direction of motion of conductor, then the middle finger will show the direction of induced current. it is also called as generator rule

Answer 2

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Question 1: What is Power of Accommodation?

AnsWeR: Power of accommodation is the ability of our eye to change the focal length of the eye crystalline lens. Due to this, the eye lens is able to see objects both from our eye and near to our eye.

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Question 2: Differentiate between Voltmeter and Ammeter.

AnsWeR:

$\boxed{\begin{tabular}{c|c}\bf Voltmeter & \bf Ammeter\\\cline{1-2}Use to measure the voltage in the circuit &Use to measure the current in a circuit.\\\cline{1-2}Represented as an encircled V. & Represented as an encircled A.\\\cline{1-2}Voltmeter is always connected in parallel. & Ammeter is always connected in series.\end{tabular}}$

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Question 3: What is right hand thumb rule ?

AnsWeR: It states that when the thumb is stretched out in the right hand towards the direction of the current in a straight current carrying conductor, the curly fingers represent the direction of magnetic fed. It is used to find out the direction of magnetic field.

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