quiz on currents and connections

if an electric current of 0.2 amperes passes through an electric heater and the potential difference between its two ends equals 220 volts, calculate the resistance of the heater

• 1100

• 44

• 9

• 2200

In the opposite figure, when the length of the rheostat wire increases

The ammeter reading will....................

and the voltameter reading will....................

• increase-increase

• decrease- decrease

• increase-decrease

• remain constant

if the electromotive force of each cell is 2 volts and the resistance equals 4 ohms, the reading of the ammeter will be.................

• 4 amperes

• 2 amperes

• 24 amperes

• 8 ampers

which figure represents a group of cells connected in parallel?

• 
• 
• 

The electric current produced from………………….. Used in the electroplating process.

• dynamo

• electric generators

• electrochemical cells

the electromotive force of this battery equals..................

• 8 volts

• 4 volts

• 6 volts

the cells are connected in ..........................and the e.m.f. of the battery =

• series - n x E1

• parallel - n x E1

• series - E1

• parallel - E1

In which of the following figures the reading of the voltameter is 3 volts (one cell = 1.5 volts)

• 
• 
• 
• 

Alternating current is characterized by..............................

• Constant intensity only

• variable direction only

• constant direction and variable intensity

• variable intensity and direction

........................current can be converted into ............................cutrent.

• direct-alternating

• alternating-direct

• direct-indirect

• contant-direct