Electrical Systems

Electrical Systems: Review and Revision

Circuit Symbols

What are circuit symbols?

Multiple Choice

Which electrical component does this circuit symbol represent?

• open switch

• close switch

• battery

• resistor

Draw

Draw the circuit symbol of an ammeter

Draw

Draw the circuit symbol of two batteries

Multiple Choice

Which electrical component does this circuit symbol represent?

• fuse

• fixed resistor

• variable resistor

• rheostat

Fill in the Blanks

There are two kinds of circuits that we have learnt: series and

,

Multiple Select

Which of these statements are true about series circuits?

• electrical components are connected one after another

• there is only one pathway where electricity can flow

• when one light bulb blows, the circuit can still work

• there is more than one pathway where electricity can flow

Multiple Choice

Voltmeters must always be connected in series.

• True

• False

Multiple Choice

Ammeters must always be connected in series

• True

• False

Recall: Voltage

The amount of electrical energy needed to move a unit charge from one point to another point is known as potential difference or voltage.

The unit of potential difference is the volt (symbol: V).

​What is the difference between the voltage in these 3 diagrams?

Open Ended

What is the difference between electron current and conventional current?

What is the difference between electron current and conventional current?

Electric current is the flow of electrons from the negative terminal of a battery to its positive terminal.

Conventional current is the flow of positive charges from the positive terminal of a battery to its negative terminal.

Recall: Current

Current is the rate of flow of electric charges.

The greater the flow of the electric charge per unit time, the larger the current.

Multiple Choice

What is the unit symbol for current?

• V

• Ohm

• kg

• A

Recall: Resistance

Resistance, R, of an electrical component is a measure of how much the component opposes the flow of electric current.

Multiple Choice

What is the unit symbol for resistance?

• V

• A

• 
  $$\Omega$$

• om

Multiple Choice

Which material will have the highest resistance?

• steel

• wood

• copper

• silver

Fill in the Blanks

When the switch is closed, what is the total resistance of the circuit?

Fill in the Blanks

Calculate the current flowing through the circuit.

Recall: Power

Power is the amount of electrical energy converted to other forms of energy per unit time.

Multiple Choice

Which of these is the unit symbol for power?

• V

• A

• W

• $$\Omega$$