Electromagnetism. Flashcards

1
Q

Ammeter is connected in?

A

Series.

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2
Q

What is electric current.

A

The rate of flow of charges.

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3
Q

Formula of electric current and measured in?

A

I= Q/t and coulombs.

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4
Q

What is direct current.

A

Current is always in the same direction.

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5
Q

Alternating current?

A

Chang8ng magnitude and the direction of the current,

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6
Q

Potientiak diffrence?

A

Difference between two points ina circuit is the work done to drive one coulomb charge between these two points.

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7
Q

Formula for voltage?

A

v= E/Q

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8
Q

EMF IS?

A

Work done by the source to drive 1 coulomb of charge round a closed circuit.

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9
Q

Voltmeter is connected

A

Parallel.

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10
Q

kj to j is?

A

x1000.

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11
Q

Resistor formula.

A

R= v/I

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12
Q

Two factors that affect resistance.

A

Length and cross sectional area

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13
Q

Explain the factors affecting resistance.

A

As length 8ncreases resistance increases. As cross external area increases resistance decreases.

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