Science Test on Batteries and Circuits

In a simple series circuit, why does a bulb light when you close the switch?

• because the switch produces electricity
• because closing the switch completes the circuit
• because closing the switch breaks the circuit

In a simple series circuit, why does the bulb go out when you close the switch?

• because the battery goes flat
• because opening the switch breaks the circuit
• because too much electricity flows through the bulb

Imagine a simple series circuit with one 1.5V battery and one bulb. When the 1.5V battery is replaced with a 3V battery...

• The bulb gets brighter
• the bulb gets dimmer
• the bulb stays at the same level of brightness

Imagine a circuit with a 1.5V battery and one bulb. Imagine a smaller circuit with a 3V battrty and 2 bulbs. Which one has brighter bulbs.

• the circuit with a 1.5V battery and one bulb
• the circuit with 3V battery amd two bulbs
• the bulbs in both circuits are one similar brightness levels

Why might a bulb flash and go out when a 1.5V battery and 3V battery are both connected across it in a simple series circuit?

• There is not enough electricity flowing around the circuit
• too much electricity flows through the bulb's filament and the bulb blows 
• the batteries are flat

What is the effect of changing the wire in a circuit from a straight thick wire to a straight thin wire?

• the bulbs become dimmer
• the bulbs become brighter
• the bulbs stay at the same level of brit

What is the effect of changing the wire in a circuit from a straight thick wire to a longer (coiled) thick wire?

• the bulbs become dimmer
• the bulbs become brighter
• the bulbs stay at the same level of brightness

In a circuit diagram, what does a circle with a cross inside it represent?

• a motor
• a battery
• a light bulb

What do the long straight lines represent in a circuit diagram?

• motors
• light bulbs
• wires

How does a battery represented in a circuit diagram?

• a circle with a cross inside it
• a circle with an M inside it
• a long line and a short line