Basic Electricity

1. The following components are control devices:

• • a) One-way switch, cell, two-way switch

• • b) One-way switch, two-way switch, push switch

• • c) Two-way switch, push switch, wire

• • d) One-way switch, push switch, motor

2. Electric current is...

• • a) The flow of protons from one atom to another

• • b) The flow of electrons inside an insulating material

• • c) The flow of electrons inside a conductive material

• • d) The flow of protons from one atom to another inside a conductive material

3. Select the option that states Ohm’s law correctly:

• • a) V = I × R

• • b) V = I / R

• • c) I = V × R

• • d) R = V × I

7. The following materials are conductors of electricity:

• • a) Copper, plastic, aluminium, wood, cork

• • b) Copper, aluminium, water, iron

• • c) Aluminium, silver, cork, paper

• • d) Paper, water, copper, iron

10. What current flows through the following circuit?

• • a) 10 mA

• • b) 1 mA

• • c) 1 A

• • d) 100 mA

4. This symbol represents:

• • a) One-way switch

• • b) Buzzer

• • c) NO push switch

• • Push switch

Electrical energy:

• is the most common form of energy because it is easy to obtain and can be transported over long distances.

• is not the most common form of energy because it is not easy to obtain but can be transported over long distances.

• can easily be transformed into other forms of energy but cannot be transported over long distances.

• is not the most common form of energy but can easily be transformed into many other forms of energy

There are four main components in a electric circuit:

• cells, batteries, resistors and motors

• power sources, load devices, conductors and control devices

• lamps, switches, resistors and conductors

• conductors, resistors, power sources and wires

The attached symbol represents:

• A resistor

• A lamp

• A motor

• A short coircuit

The control devices:

• allow or prevent the flow of the electric current through the circuit

• receive the electrical energy and convert it in other types of useful energy

• Increase o reduce the voltage of a circuit between two points

• Change the direction of the flow of the electric current