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Physics chapter 10 Electrical circuits
- Circuits in series and parallel
- Current
- In series
- The current is the same everywhere
in a series circuit. It does not matter
where you put the ammeter, it will
give you the same reading.
- The current in a series circuit
depends upon the number of
cells. The more cells you add,
the greater the current.
- The current is the same everywhere
in a series circuit. It does not matter
where you put the ammeter, it will
give you the same reading.
- In
parallel
- When two or more components
are connected in parallel, the total
current flowing in the circuit is
shared between the components.
- When two or more components
are connected in parallel, the total
current flowing in the circuit is
shared between the components.
- Voltage
- In
parallel
- When two or more components are connected in parallel,
the potential difference across them is the same. This
means that if a voltage across a lamp is 12 V, the voltage
across another lamp connected in parallel is also 12 V.
- When two or more components are connected in parallel,
the potential difference across them is the same. This
means that if a voltage across a lamp is 12 V, the voltage
across another lamp connected in parallel is also 12 V.
- In series
- When two or more components are
connected in series, the total potential
difference of the supply is shared
between them. This means that if you
add together the voltages across each
component connected in series, the
total equals the voltage of the power
supply.
- When two or more components are
connected in series, the total potential
difference of the supply is shared
between them. This means that if you
add together the voltages across each
component connected in series, the
total equals the voltage of the power
supply.
- Resistance
- In
parallel
- In series
- Current
- Electrical components
- NTC
thermistor
- Thermistor`s are used as a temperature sensor
at low temperatures they have a high
resistance but at high temperatures they have
a low resistance which will allow a larger
current to pass through them. Uses for these
include in freezers for when the door is left
open it will allow a current to flow to a
buzzer/alarm that will warn you when it is too
hot.
- Thermistor`s are used as a temperature sensor
at low temperatures they have a high
resistance but at high temperatures they have
a low resistance which will allow a larger
current to pass through them. Uses for these
include in freezers for when the door is left
open it will allow a current to flow to a
buzzer/alarm that will warn you when it is too
hot.
- LDR- (light
dependent
resistor)
- Light dependent resistors are light sensors. At low
light levels the resistance of the LDR is high and at
low light levels the resistance of the LDR is low
which allows a larger current to pass through them.
Uses for these include street lamps where when the
light levels become low the lamp turns on.
- Light dependent resistors are light sensors. At low
light levels the resistance of the LDR is high and at
low light levels the resistance of the LDR is low
which allows a larger current to pass through them.
Uses for these include street lamps where when the
light levels become low the lamp turns on.
- NTC
thermistor
- Kirchoff`s laws
- Kirchoffs first law
- The sum of currents going
into a point must equal the
points flowing out of a point.
- The sum of currents going
into a point must equal the
points flowing out of a point.
- Kirchoffs second law
- In any circuit, the sum of
the electromotive forces is
equal to the sum the
electromotive forces is
equal to the sum of the p.d.s
around a closed loop
- In any circuit, the sum of
the electromotive forces is
equal to the sum the
electromotive forces is
equal to the sum of the p.d.s
around a closed loop
- Kirchoffs first law
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