Electricity and electronics (Electronic components (Variable resistors…
Electricity and electronics
Components of an electrical circuit
Earth-leakage circuit breaker
Measured in amperes or amps
I=Q / t
electric charge is measured in Coulomb
1C=6,25 X 10(18) Electrons
Curret is measured in ammeters
Measured in volts
V=I · R
I=V / R
R=V / I
Types of circuit
same potential difference of each element
l f we connect several similar generators in parallel, they will supply the same voltage, but it will last longer
different current that flows through each branch
lnvariably, they maintain the current that flows through the elements in series, and the voltage of the elements in parallel.
To determine the equivalent resistance of the circuit, we calculate the partial resistance of each branch and combine them.
Types of current
Between the terminals of a battery there is a constant voltage that doesn't vary with time
the electrons always flow in the
same direction and with a steadv t.urrent
The positive and negative terminals are constantly changing inside the socket, also, the electrons don't circulate with the same level of current.
The voltage or tension that flows to our homes is known as an alternating signal
The electrons that flow through an appliance connected to a socket keep changing direction.
Obtain by power stations
The rms value of an alternating electric current is the value that a direct current should have to produce the same energy effect.
We can use transformers to increase or reduce the alternating voltage.This allows us to transport electric energy at very high levels of voltage without losing too much energy through the cables
The energy that a generator produces in order to maintain a current is consumed by the receivers.
If the current flowing through an electncal apphance is I, and itsoperaung voltage is V
then, the energy consumed by the appliance in a given time can be represented as follows:
E = V · I · t = I(2) · R · t
measured in joules (J).
Electric power is the capacity of an electric receiver to transform
energy in a fixed period of time.
Measured in Watts (W)
Effects of electric current
Basis of electromagnetism
All electric currents create magnetic fields
A changing magnetic field can produce an electric current
It's any appliance that can use electromagnetic effects ton produce electricity or convert it into mechanical energy
light dependent resistors