ELECTRIC CURRENT

The resistance of a metal conductor:

• It increases when we increase the voltage we apply to its poles, while its temperature is kept constant.

• It increases when we increase the intensity of the electric current that flows through it, while its temperature is kept constant.

• It is equal to the quotient of the intensity of the electric current flowing through the conductor to the electrical voltage that we apply to its ends

The role of the electrical source in a circuit is to:

• generate electrical charges

• set in motion the loads that pre-exist in the circuit.

• convert electric energy into chemical energy

Ohm's law applies:

• for vacuum lamps

• for crystal rectifiers

• for metal conductors of constant temperature

When two resistors R1 and R2 are connected in series:

• have the same voltage at their poles

• they have the same current intensity I

PPC meters count:

• the electric charge we consume

• the electricity we consume

• the electric energy we consume

A photoelement converts:

• chemical energy into electric energy

• mechanical energy into electric energy

• light energy into electric energy

Which of the following statements is FALSE.

• Electric current carries electric energy.

• Electric current is oriented movement of electric charges.

• The direction of the electric current is the movement of positive charges.

Electric motors:

• convert electric energy into kinetic energy

• convert kinetic energy into electric energy

To measure the voltage V at the poles of a consumer we need to connect the voltmeter:

• in series

• in parallel

The unit of measurement of electric current intensity is:

• 1 V

• 1 A

• 1 Ω

• 1 J