Batteries and LEDs Quiz

What is the primary purpose of a battery?

• To convert light into electricity

• To store electrical charge

• To generate heat

• To store mechanical energy

What is the usual voltage range of batteries used in school projects?

• 5 volts to 15 volts

• 0.5 volts to 3 volts

• 3 volts to 12 volts

• 1.5 volts to 9 volts

What are the two electrodes in a battery called?

• Source and Drain

• Emitter and Collector

• Positive and Negative

• Anode and Cathode

What is the function of the electrolyte in a battery?

• To separate the anode and cathode

• To conduct the flow of electrons between the electrodes

• To generate light

• To store electrical charge

What is the typical composition of the electrolyte in a battery?

• Water and salt

• Water and sulphuric acid

• Water and sugar

• Water and baking soda

What happens when a torch is turned on?

• Electrons flow from the battery and through the torch circuit

• The battery generates heat

• The electrolyte evaporates

• The anode and cathode switch places

Why are resistors used in circuits with LEDs?

• To convert light into electricity

• To store electrical charge

• To protect the LED from voltages over 3 volts

• To increase the voltage

What is the voltage of each AA battery in the simple circuit example?

• 3 volts

• 1.2 volts

• 1.5 volts

• 2 volts

What is the total voltage when two AA batteries are connected in series?

• 1.5 volts

• 3 volts

• 6 volts

• 4.5 volts

What is the maximum current most LEDs can handle?

• 100ma

• 200ma

• 300ma

• 400ma