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Physics (electric charge flow)
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Chloe Tweedie
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Cards (21)
What is the unit used for smaller currents in electrical circuits?
Milliampere
(
mA
)
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How many
milliamperes
are in one ampere?
1000
mA
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What is the smallest unit of current mentioned in the material?
Microampere
(
µA
)
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How is a current of 1
ampere
defined in terms of charge?
A current of 1 ampere flows when 1
coulomb
of charge passes a point in a circuit in 1
second
.
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If a
current
of
5A
is flowing in a circuit, how much
charge
passes a point in 1 second?
5C
of charge passes every point in 1 second.
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What is the
formula
to calculate the
charge
passing a point in a circuit?
Q =
I
x t
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What do the symbols
Q
,
I
, and t represent in the charge formula?
Q: Charge (
coulombs
)
I: Current (
amperes
)
t: Time (
seconds
)
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If a
current
of
150 mA
flows for
1 minute
, how much
electrical charge
flows past a point in the circuit?
9C
of charge flows past the point.
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How do you convert
30
µA
to
milliamperes
(mA)?
30 µA =
0.03
mA
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How do you convert
50,000
µA
to
milliamperes
(mA)?
50,000 µA = 50 mA
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How do you convert
1,000,000
µA
to
amperes
(A)?
1,000,000 µA = 1 A
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What is the current in
amperes
if 400
mA
is converted?
0.4
A
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What is the
charge
delivered if a
current
of 6A flows for 10
seconds
?
60C
of charge is delivered.
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What is the
charge
delivered if a current of
300 mA
flows for
1 minute
?
18C
of charge is delivered.
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How do you calculate the current when a
charge
of
100C
passes in
5 seconds
?
Current
=
Q
t
=
\frac{Q}{t} =
t
Q
=
100
C
5
s
=
\frac{100C}{5s} =
5
s
100
C
=
20
A
20A
20
A
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What happens to the
energy
in a circuit when it passes through a
light bulb
?
The
charge
deposits energy in the light bulb
The energy is converted to light and heat
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What happens to the
energy
in a circuit when it passes through a
motor
?
The motor uses energy to create movement
The energy is also converted to
heat
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How is
voltage
measured in a circuit?
Using a
voltmeter
placed in parallel across the
component
.
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What is the
electromotive force
(
EMF
) of a cell?
The highest
potential difference
when the cell is not supplying current.
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Why does the
potential difference
drop when a
current
is being supplied by a
cell
?
Due to energy wastage inside the cell.
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If a car battery is labelled
12V
, what might it deliver when used to turn a
starter motor
?
It may only deliver
10V
when in use.
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