Circuits

What are three components required for a circuit?

• Switch, conductor, insulator

• Source, conductor, receiver/resistor

• Source, switch, receiver/resistor

• Source, insulator, conductor

Electric potential divided by current (V / I) will be how you calculate ____.

• Power

• Current

• Watts

• Resistance

Answer explanation

V=IR

Volts= current * resistance

What is the relationship between the readings on ammeters A₁, A₂ and A₃?

• A₃ = A₁ + A₂

• A₁ = A₂ + A₃

• A₁ = A₂ = A₃

• A₃ = A₁ - A₂

Answer explanation

Series circuit have the same current everywhere.

It takes 110 volts to drive a 15 ampere current through a small light. What is its resistance?

Answer explanation

Resistance= V/I

110 V/ 15 A = 7.3 Ohms

What is the equivalent resistance (a.k.a. total resistance) of the three resistors shown?

Answer explanation

1/6+1/9+1/18=0.3333

1/0.3333= 3.0

In the parallel circuit at right, it is certain that ____.

• the voltmeter shown reads 9.0 V

• the ammeter shown reads 0.75 A

• the combined resistance is more than 24 Ω

• the voltmeter shown reads 4.5 V

Answer explanation

In parallel circuits, the voltage for the whole circuit and the voltage across each individual branch should be the same number.

The diagram shows a ___.

Answer explanation

If there is only one path or loop on which current can flow, it is called a series circuit.

This picture shows a 24 V battery connected to an 8.0 Ω resistor. How much current runs through the circuit?

• 192.0 A

• 3.0 A

• 0.33 A

• 4.0 A

Answer explanation

Voltage/resistance=Current

24/8=3.0 A

The flow of electricity requires a...

• Complete path

• Complex Circuit

• Incomplete Path

• Simple Circuit

What is the current in R₂?

• 12 A

• 33.0 A

• 36 A

• 0.33 A

Answer explanation

V=I*R

Find the Rtotal first

12+6+18= 36

12 v/ 36 = 0.33 A