CHAPTER 5 (INTRO) WEEK 7

An electrical junction has three wires A, B and C connected to it. Wire A carries 4.2 A going in, wire B carries 2.6 A going out. What does wire C carry?

• 1.6 A going in

• 1.6 A going out

• 6.8 A going in

• 6.8 A going out

Current is shared between two resistors of 3 Ω and 6 Ω, if the current in the 6 Ω is 12 A what is the total incoming current?

• 24 A

• 36 A

• 18 A

• 72 A

The picture shows an electrical circuit. This circuit is a series circuit because: 

• It has 3 light bulbs.
• The same current flows through all three light bulbs.
• It uses a single battery.
• The electrical current is divided between the three light bulbs.

This is the symbol for a _____?

• switch
• light 
• battery
• wires

This type of circuit only has one path for current to flow. 

• series
• parallel
• combination
• split

What is one problem with using a series circuit? 

• It has a lot of series. 
• If one goes down, they all go down! 
• It doesn't work properly.
• There are no problems. 

If the cell above has a potential difference of 8V, what is the potential difference across one bulb? Assume both bulbs are identical.

• 8V

• 4V

• 16V

• 2V

In a series circuit, there are 3 loads connected. Each individual load has a voltage of 4V. What is the voltage of the battery?

• 3 V

• 4 V

• 12 V

• 1 V

An electrical junction has four wires A, B, C and D connected to it. Wire A carries 7A going in, wire B carries 5 A going out and wire C carries 2 A going in. What does wire D carry?

• 10 A going out

• 5 A going out

• 4 A going in

• 4 A going out

For the circuit shown, the resistances are R₁ > R₂ > R_3. What is true about the current through each resistor?

• I₁ = I₂ = I₃

• I₁ > I₂ > I₃

• I₁ > I₃ > I₂

• I₁ < I₃ < I₂