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unit 3 BTEC science > physics > Flashcards

physics Flashcards

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1
Q

what is a battery

A

made up of more than one cell

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2
Q

what is an ammeter

A

measures the current that flows through a component in a circuit

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3
Q

how is an ammeter placed

A

in series with the component

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4
Q

what is a voltmeter

A

measures voltage across a component in a circuit

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5
Q

how is a voltmeter placed

A

placed in parallel with the component

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6
Q

what is a resistor

A

component that limits the flow of electrons (current) in a circuit

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7
Q

what is a variable resistor

A

used to change the current in a circuit

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8
Q

what is a diode

A

allows current to flow in only one direction

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9
Q

what is power

A

the rate of doing work

-the amount of energy consumed per unit of time

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10
Q

what is work done

A

the amount of energy supplied or tranformed

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11
Q

what is the formula for electrical power

A

power = voltage X current

P=VxI

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12
Q

What is the formula for physical power

A 
power = work done / time
P = E/T
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13
Q

what is a fuse

A

a component of the circuit that will ‘blow’ if there is a fault in the circuit

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14
Q

what is the formula for a resistor in series

A

Rtotal = R1+R2

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15
Q

what does it mean when a resistor is in series

A
  • same current
  • shared voltage
  • total resistance = the sum of all the resistors
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16
Q

what is the formula for a resistor in parallel

A

1/Rtotal = 1/R1 + 1/R2

17
Q

what does it mean when a resistor is in parallel

A
  • same voltage
  • shared current
  • total resistance is smaller than the smaller resistance in the circuit
18
Q

what is a series circuit

A

when components are placed one after the other in the same loop of the circuit and the current which passes through each component is the same

19
Q

what is a parallel circuit

A

when components are connected between the same 2 points in a circuit and the voltage drop across each component is the same

20
Q

what is the formula for voltage

A 
V= E/Q
voltage = energy transferred / charge
21
Q

what is the formula for amps

A 
I = Q/T
amps = charge/ time

unit 3 BTEC science (4 decks)

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