3/1 t2 mt

Electrostatic force F is directly proportional to:

• r² (distance squared)

• q1 and q2

• distance only

• q1 only

Which is the value of the constant in Coulomb's equation?

• k = 9·10^-9

• k = 6.67·10^-11

• k = 9.8

• k = 9 ·10⁹

What charges attract each other?

• positive and negative

• negative and negative

• positive and positive

• north and north

Materials that hold electrons very tightly, and thus don't allow much static electricity to occur around them, are called

• conductors

• insulators

• semiconductors

• capacitors

The scientist who discovered the relationship of current, voltage and resistance?

• Andre Marie Ampere

• Thomas Edison

• Benjamin Franklin

• George Ohm

What happens to brightness of bulbs in series circuit?

• The bulbs will give off the same amount of light when more light bulbs are added

• If one light bulb does not work, the other ones will still light up.

• The bulbs will give off less light when more light bulbs are added

• If the bulb is unscrewed then the ones behind it won’t work either

The word potential difference has a unit of ______

• Current

• Resistance

• Volt

• Ma

It is a measure of how difficult it is for the electrons to flow through a conductor.

• Resistance

• Voltage

• Current

• Electricity

What should you do first to the situation? It was stormy, you and your friend were at the middle of the forest, your friend is in danger, calling for help is not a choice because you alone and your friend were just there.

• call for help

• find a wood

• stay as low as possible

• switch of the main fuse

Is a device that joins an electrical appliance to a mains socket.

• circuit

• plug

• wire

• fuse