1. Indicate which of the following statements is true:

• • a) In a series circuit, the same voltage flows across all the resistors.

• • b) In a parallel circuit, the same electric current flows across all the resistors.

• • c) In a parallel circuit, the total current is the sum of the currents flowing across each resistor.

• • d) In a series circuit, the voltage is the same across each resistor.

2. Electric current is produced by...

• • a) The movement of protons in semiconducting materials.

• • b) The movement of electrons in insulating materials.

• • c) The movement of electrons in conducting materials.

• • d) The movement of protons in conducting materials.

3. Indicate which of the following statements is true:

• • a) A thermistor is the same thing as a transistor.

• • b) A thermistor is a variable resistor that I can manually set to the desired value.

• • c) A transistor can amplify the electric current flowing through its base.

• • d) An LDR is a temperature-dependent variable resistor.

4. Electric power measures..

• • a) The amount of energy transferred to the electrons in a circuit.

• • b) The energy lost due to friction in the wires.

• • c) The energy delivered to a load device in a specific unit of time.

• • d) The energy gained in a circuit due to temperature increases caused by the Joule effect.

6. Voltage is:

• • a) An electrical variable that indicates the energy difference between two points in a circuit.

• • b) The electrical energy of the protons in a circuit.

• • c) The energy dissipated by a load device in a circuit.

• • d) An electrical variable that indicates the opposition to the flow of an electric current.

7. The unit used to measure electrical energy is:

• • a) The kWh

• • b) The w·s

• • c) The joule

• • d) All of them

8. Ohm's law relates the three fundamental variables of an electric circuit. These are:

• • a) Voltage, current and resistance

• • b) Voltage, current and resistivity

• • c) Voltage, current and energy

• • d) Power, current and resistivity

9. Diodes...

• • a) Let the electric current flow when they are reverse biased

• • b) Are able to amplify the electric current.

• • c) Always interrupt the flow of electric current regardless of how they are positioned.

• • d) Let the electric current flow when they are forward biased.

10. The symbols of the units of measurement for the voltage, current and resistance of a circuit are:

• • a) V, A, µ

• • b) V, J, Ω

• • c) V, A, Ω

• • d) V, J, µ

In a circuit with capacitors the main used formula is:

• C = V x Q

• V = Q/C

• Q = C/V

• C = V/Q