3pr 2nd Sci U2L2:The Electric Current and Cells.

Direct current can be produced from …...

• electrochemical cells
• electric generators.
• electric power stations.
• electric motors.

The instrument which is used to convert chemical energy into electric energy is …..........

• electric cell.
• dynamo.
• motor.
• electromagnet.

From the examples of electrochemical cells is …......

• ohmmeter.
• dynamo.
• dry cell.
• rheostat.

In the electric cell, the ….... energy is converted into electric energy.

• kinetic
• magnetic
• chemical
• mechanical

The alternating current is used in ….......

• lighting houses and streets.
• operating appliances.
• lighting houses and streets & operating appliances.
• electroplating processes.

One of the properties of the direct current is …...........

• change value.
• change direction.
• constant value and direction.
• change value and direction.

…....... is used in electroplating process.

• Electric generator
• Electric cell
• Electric motor
• Electromagnet

All of the following are from the properties of direct current, except it …..........

• is unidirectional.
• has constant intensity.
• can be transferred to short distances.
• can be converted to alternating current.

The electric current that is produced from the dynamo is

• an alternating current that cannot be converted into direct current.
• a direct current that can be converted into alternating current.
• an alternating current that can be converted into direct current.
• a direct current that cannot be converted into alternating current.

…..... is used to produce direct electric current.

• Dynamo
• Rheostat
• Ammeter
• Dry cell