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Physics > Topic 3 - Basic electricity > Flashcards

Topic 3 - Basic electricity Flashcards

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1
Q

Units

A

(E) Energy - joules (J)
(Q) Charge - Coulombs (C)
(V) Voltage - Volts (V)
(I) Current - Amps (A)
(R) Resistance - Ohms (Ω)

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2
Q

Equations

A
  1. Energy = voltage x charge (E=VxQ), Voltage = energy ÷ charge (V=E÷Q), Charge = energy ÷ voltage (Q=E÷V)
  2. Charge = current x time (Q=IxT), Current = charge ÷ time (I=Q÷T), Time = charge ÷ current (T=Q÷I)
  3. Voltage = current x resistance (V=IxR), Current = voltage ÷ resistance (I=V÷R), Resistance = voltage ÷ current (R=V÷I)
  4. Resistance = voltage ÷ time (R=V÷T), Voltage = resistance ÷ time (V=R÷T), Time = resistance ÷ voltage
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3
Q

Lamp

A
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4
Q

Cell

A
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5
Q

Battery

A
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6
Q

Ammeter

A
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7
Q

Voltmeter

A
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8
Q

Resistor

A
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9
Q

Current- series

A

The current is the same at all parts in the circuit.  

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10
Q

Current- parallel

A

The total current in the circuit is the sum of the currents through the separate branches. (Current splits at a junction and how the current splits depends on the relative resistance of each branch).

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11
Q

Voltage- series

A

The total voltage is divided (shared) between the components.

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12
Q

Voltage- parallel

A

The voltage is the same across each branch in the circuit, and is equal to the voltage of the power supply

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13
Q

Resistance- series

A

The total resistance is the sum of the separate resistances. As you add more components in series, the total resistance increases and the total current decreases.

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14
Q

Resistance- parallel

A

The total resistance reduces as you add more components in parallel. The total resistance in a parallel circuit is equal to the sum of the inverse of each individual resistances.

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15
Q

Current

A

The rate of flow charge

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16
Q

Voltage

A

The energy transferred per unit charged passed

17
Q

Electric current in solid metallic conductor

A

In solid metallic conductors is a flow of negatively charged electrons

18
Q

Why is current protected at a junction in a circuit?

A

This is because current is conserved as no charge has been gained or lost.

19
Q

What do lamps & LEDs help with in a circuit?

A

Can be used to show the presence of current a circuit

20
Q

Describe the effect of the current in a circuit when the resistance is changing?

A

As you increase the resistance in a circuit, the current will decrease

21
Q

Increases voltage in the circuit

A

Decrease the resistance in a circuit, the current will increases voltage

Physics (11 decks)

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