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Physics > Electricity And Circuits > Flashcards

Electricity And Circuits Flashcards

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1
Q

What is current?

A

The rate of flow of charge

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2
Q

What is the equation for current?

A

Current = charge/time

I=Q/T

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3
Q

What is the symbol for current?

A

I

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4
Q

What is the symbol for charge?

A

Q

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5
Q

When does a current occur?

A

When charges move through a conductor

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6
Q

What do electrons have in an electrical circuit and what do they do?

A

They have a negative charge and flow from negative to positive

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7
Q

What is direct current? (DC)

A

all the charges move in one direction around the circuit

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8
Q

What is alternating current? (AC)

A

Charges constantly change direction

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9
Q

What is direct current like on a graph?

A

All positive

Or

All negative

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10
Q

What is alternating current like on a graph?

A

Positive and negative

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11
Q

What does an ammeter measure?

A

The current of a circuit

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12
Q

What is a series circuit?

A

Only one loop where all components are connected

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13
Q

What is a parallel circuit?

A

More than one loop where the components are in different branches

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14
Q

What is potential difference (voltage)?

A

The energy transferred per unit charge

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15
Q

What is the equation for energy transferred?

A

Energy transferred=charge X potential diff

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16
Q

What is the equation for potential difference?

A

Potential difference = current X resistance

17
Q

What does a voltmeter measure?

A

Potential difference

18
Q

Explain the 4 steps of resistance

A
  1. Electrons collide with ions
  2. Some electrical energy is wasted as heat
  3. The heat energy is dissipated to surroundings
  4. This is when the current passes through the resistor causing it to heat up
19
Q

How can less energy be wasted in resistance?

A

By using wires with a very low resistance

20
Q

How can the wasted energy from resistance cause problems?

A

Wires can heat up and burn

21
Q

What is the equation for energy in circuits?

A

Energy = current x time x voltage

E=ITV

22
Q

What are the 2 equations for power in circuits?

A

Power = current X voltage

Power = current^2 X resistance

23
Q

What is the voltage of the mains?

A

230v

24
Q

Voltage is _______ to resistance

A

Directionally proportional

25
Q

Current is _______ to resistance

A

Inversely proportional

Physics (7 decks)

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