Resistance in a circuit

What is resistance?

• the fact that the electrons are not affected by the voltage

• the stopping effect copper wire has on the current

• how hard it is for the electrons to flow

What are the units of resistance?

• ohms

• volts

• coulombs

• amps

What is the symbol for the unit of resistance?

• Q

• O

• U

• Ω

Voltage tries to push the current around the circuit and resistance makes it harder for the current to do so

• True

• False

Every component has some resistance

• True

• False

What could we compare a component to?

• a pump

• a pipe

• an obstacle

When the resistance of a branch increases, what happens to the current in that branch?

• It stays the same, because it is as easy as before to travel through that branch

• It increases, because it is now easier to travel through that branch

• It decreases, because it is now harder to travel through that branch

Adding a component in series, ...

• increases the overall resistance of the circuit, because it is now harder for the current to go around

  (there is an extra obstacle on the way)

• decreases the overall resistance of the circuit, because it is now easier for the current to go around 

  (there is an extra pathway to make it back to the battery)

Adding a component in parallel, …

• increases the overall resistance of the circuit, because it is now harder for the current to go around

  (there is an extra obstacle on the way)

• decreases the overall resistance of the circuit, because it is now easier for the current to go around

  (there is an extra pathway to make it back to the battery)