Ohm's Law Flashcards

Basic circuit relationships and conditions

1
Q

What is the formula for ohm’s law?

A

V = IR or Voltage = Current x Resistance

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2
Q

Why is Ohm’s law helpful/useful?

A
  • understand how electrical equipment works
  • install and connect circuits safely
  • identify when electrical equipment might be unsafe
  • figure out why electrical equipment is not working correctly
  • repair faulty electrical equipment
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3
Q

What happens if voltage increases for a constant resistance?

A

Current Increases proportionally.

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4
Q

What happens if resistance increases for a constant voltage?

A

Current decreases

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5
Q

What happens if current increases for a constant resistance?

A

Voltage increases.

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6
Q

Name the three circuit conditions:

A

Open-Circuit
Closed-Circuit
Short-Circuit

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7
Q

What happens in a closed-circuit?

A

Circuit is energised

Voltage drop across resistors

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8
Q

What happens in an open-circuit?

A

No current in circuit
Voltage across open circuit is equal to supply voltage
Circuit is not energised

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9
Q

What happens in a short-circuit?

A

Circuit is energised
No resistance (apart from conductors resistance)
Peak current output
tripping of protective devices

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