P4 - Electric Circuits Flashcards

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1
Q

Draw symbol for

A
Switch open and closed 
Cell
Battery 
Diode
Resistor 
Variable resistor 
LED
Lamp
Fuse
Voltmeter
Ammeter
Thermistor
LDR
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2
Q

What is electrical current

A

The flow of electrical charge. The size of the current is the rate of flow

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3
Q

Equation linking charge flow and current?

A

Charge flow = current x time

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4
Q

Equation linking potential difference and current

A

Potential difference = Current x Resistance

V = I x R

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5
Q

What is the rule for current through a resistor?

A

The current through an ohmic conductor (at constant temp)is directly proportional to the potential difference across the resistor. This means that the resistance remains constant as the current change

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6
Q

Rule for the current and potential difference through a lamp

A

The resistance of a filament lamp increases as the temperature of the filament increases

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7
Q

Link between potential difference and current in a diode?

A

The current through a diode flows in 1 direction only with very high resistance in the reverse direction

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8
Q

What is a thermistor and it’s use?

A

The resistance of a thermistor decreases as the temperature increases

Use- in circuits in a thermostat

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9
Q

What is an LDR (light dependant resistor) and it’s use?

A

The resistance of an LDR decreases as light intensity increases

Use - in circuits switching lights on when it gets dark

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10
Q

What are the rules for a series circuit

A
  • Current is the same everywhere
  • Potential difference is shared between components. P.D of all components add to the P.D of the source
  • Resistance shared aswell
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11
Q

What are the rules for a parallel circuit?

A
  • Potential difference across each component is the same
  • The total current through the whole circuit is the sum of the currents through the separate components
  • The total resistance of 2 resistors is less than the resistance of the smallest individual resistor
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