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Physics Unit 2 > Electrical Circuits > Flashcards

Electrical Circuits Flashcards

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1
Q

describe how an voltmeter should be arranged in a circuit

A

in parallel- across the component

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2
Q

what is the role of a variable resistor

A

it allows current to be varied

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3
Q

what is the resistance in a circuit with 2,5 and 3 ohm resistors in

A

10ohms

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4
Q

the voltage of a battery in parallel circuit is 3V. the circuit has 3 branches. how many volts does each branch get

A

3V. Voltage is not shared in parallel circuits

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5
Q

the voltage of a battery in series is 8V. There are 2 resistors in the circuit both with the same resistance. What is the PD across each resistor

A

4V each. The resistors are of equal rating which means energy is shared equally

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6
Q

what is current

A

flow of electrons

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7
Q

what is PD (potential difference)

A

the energy transferred or the work done per unit of charge

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8
Q

why does a bulbs resistance increase as the PD across it gets larger

A

the bulb gets hotter

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9
Q

unit for power

A

W- watts

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10
Q

what is a DC supply

A

direct current- current flowing in one direction only eg a battery

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11
Q

what happens to the resistance of a bulb if it gets hot

A

it increases

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12
Q

what happens to the resistance of a thermistor when it gets hotter

A

the resistance decreases so the heat energy is used to release more electrons to flow. the current increases

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13
Q

how does increasing the resistance affect current

A

as resistance gets higher, current decreases

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14
Q

how does increasing the resistance of a resistor affect the PD across it if the current remains the same

A

the PD increases. Current supplies more energy to get through the higher value resistor

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15
Q

what is an LED

A

light emitting diode

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16
Q

why is an LED more efficient than a filament bulb

A

less heat energy is lost in an LED

17
Q

what happens to a resistor when a current flows through it

A

electrical energy is transformed into heat energy

18
Q

3 uses for a circuit containing a thermistor

A
  • anything that requires temp. to be monitored
  • a thermostat
  • a temp. sensor in an incubator/fridge etc.
19
Q

give the use of a circuit containing an LDR

A

a circuit that switches on when it gets dark

20
Q

what is a diode

A

a component which allows current to flow only in one direction as it has a huge resistance in the other

21
Q

describe how am ammeter should be arranged in a circuit

A

In series- in the same loop as components

Physics Unit 2 (13 decks)

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