ohm's law Flashcards

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1
Q

What is ohm’s law?

A

The ratio of potential difference to current is a constant called resistance

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2
Q

What is potential difference?

A

Voltage (V)

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3
Q

What is current?

A

Ampere (I)

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4
Q

What is resistance?

A

Ohm (Ω)

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5
Q

How is voltage (V) calculated?

A

IR

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6
Q

How is current (I) calculated?

A

V/R

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7
Q

How is resistance (R) calculated?

A

V/I

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8
Q

What are non-ohmic electrical loads?

A

Electrical loads that do not obey ohm’s law => do not have constant resistance when they heat up

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9
Q

In a non-ohmic load, the current of a light bulb does not increase as much because?

A

Resistance increases as temperature increases

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10
Q

What are 4 factors that affect the resistance of wires?

A
  • type of material
  • length of wire
  • thickness
  • temperature
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11
Q

Longer or shorter wire has more resistance?

A

Longer

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12
Q

Does narrow wire have more or less resistance?`

A

More resistance

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13
Q

Does higher temperature have more or less resistance?

A

More– more particles moving around and blocking it

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