# Radio engineering for beginners

Максим Исаев
Reading time: 2 min
478

## Radio engineering for beginners

People with different levels of knowledge in radio engineering come to study diagnostics and circuitry in Bgacenter. This material will be useful for those who are just beginning to master the profession of Phone Repair Technician.

## Serial connection

When the elements are connected in series, the same current flows through them:

I = I1 = I2 = I3

When the resistors are connected in series, the total resistance of the circuit is equal to the sum of these resistances:

R = R1 + R2 +R3

When the resistors are connected in series, the sum of the voltage drop across them is equal to the voltage at the source terminals:

U = U1 + U2 +U3 ## Parallel connection

The total resistance of the circuit in parallel connection of resistors is always less than the smallest of the resistors:

1/R = 1/R1 + 1/R2

## Ohm’s law for a chain section

From Ohm’s Law follows:

the greater the resistance R, the smaller the current I at the same voltage U between the ends of the conductor.

### Current ## Kirchhoff’s Laws

The First law:

The sum of all currents flowing into the node is equal to the sum of all currents flowing from the node. I1 – current flowing into the node,

I2, I3 – currents flowing from the node.

I1 = I2 + I3

or

I1 – I2 – I3 = 0

The Second Law:

In a closed circuit of an electric circuit, the sum of all EMFs is equal to the sum of the voltage drop in the resistances of the same circuit.

## Conclusion

The article provides basic material for beginners to learn how to repair phones and tablets. During training in diagnostics and bga soldering, we begin with the basics of radio engineering. This is the foundation.

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