Year 7 electrical check

An example of a direct current is;

• A battery

• A wall plug

• Superman

• The sea

Answer explanation

A battery is an example of a direct current it will always deliver the same level of voltage at any time.

Tags

direct current

A plug socket in the wall provides an alternating

Answer explanation

The answer is current. There are two types of electrical current. Direct current which we call DC and alternating current which we call AC.

Tags

electrical currents

Match the electric symbol to its correct name.

• Switch

• 
• Buzzer

• 
• Motor

• 
• LED

• 
• Battery

• 

Answer explanation

Electrical symbols are important because it does not matter what language you speak you can understand the pictures.

Tags

electric symbols

Click on the positive of the battery.

Answer explanation

The nodule on top of the battery helps us to know this is the positive side on the battery.

Tags

direct current

A lemon battery is just as good as an AA battery.

• Yes it is just as good

• The voltage from a lemon battery is less than an AA battery.

• It is more powerful than an AA battery.

• It is just as powerful and makes a tasty snack afterwards.

Answer explanation

Lemon batteries are a fun experiment but do not provide a high enough voltage for long periods of time to power products.

Tags

direct current