Electricity

Question 1

What happens when one bulb fails in a parallel circuit?

Answer 1

The rest of the circuit continues to work.

Question 2

How does the total current change when more components are added in a parallel circuit?

Answer 2

The total current drawn increases.

Question 3

What is the voltage in each branch of a parallel circuit?

Answer 3

The same as the supply voltage.

Question 4

How must voltmeters be connected to a circuit?

Answer 4

In parallel.

Question 5

What is the SI unit for voltage?

Answer 5

Volt (V).

Question 6

What instrument is used for measuring voltages?

Answer 6

Voltmeter.

Question 7

What does voltage measure in a circuit?

Answer 7

How much energy the electrons receive.

Question 8

What are examples of different voltages supplied by cells and batteries?

Answer 8

• 12 V Car Battery
• 1.5 V Dry Cell
• 9 V Dry Cell

Question 9

What is the defining characteristic of a parallel circuit?

Answer 9

It divides into two or more branches.

Question 10

In what way does current flow in a parallel circuit?

Answer 10

The current divides and flows through each parallel branch.

Question 11

What happens if a component breaks in a parallel circuit?

Answer 11

The other components remain on.

Question 12

How must ammeters be connected to a circuit?

Answer 12

In series.

Question 13

What is the SI unit for electric current?

Answer 13

Amps (A).

Question 14

How is electric current represented in equations?

Answer 14

I.

Question 15

What is the relationship between current in a series circuit?

Answer 15

The current is the same at all points.

Question 16

What is the relationship between current in a parallel circuit?

Answer 16

The current is shared between the components.

Question 17

What is the relationship between voltage in a series circuit?

Answer 17

Voltage is shared between the components.

Question 18

What is the relationship between voltage in a parallel circuit?

Answer 18

Each voltage is equal to the supply voltage.

Question 19

How do you find total resistance in series?

Answer 19

Add each resistance together.

Question 20

What is Ohm’s Law?

Answer 20

The current flowing through a conductor is directly proportional to the potential difference between its ends.

Question 21

What is the formula for calculating resistance?

Answer 21

R = V / I.

Question 22

What happens to resistance when resistors are connected in series?

Answer 22

The resistance adds up and increases.

Question 23

What happens to resistance when resistors are connected in parallel?

Answer 23

The resistance decreases.

Question 24

What is the charge on a proton?

Answer 24

1.6 x 10^-19 C.

Question 25

What does an open circuit mean?

Answer 25

An incomplete circuit.

Question 26

What is the flow of electric charges in a circuit called?

Answer 26

Electric current.

Question 27

What is the fundamental unit of matter called?

Answer 27

Atom.

Question 28

What is the path along which electric current moves called?

Answer 28

Electric circuit.

Question 29

What is the device that causes the flow of electrons through a circuit?

Answer 29

Cell or power source (battery).

Question 30

What is the symbol for electric charge?

Answer 30

Q.

Question 31

How is electric current defined?

Answer 31

The amount of charge flowing per second.

Question 32

What is the relationship between current, charge, and time?

Answer 32

Current in Amps (A) = Charge transferred in coulombs (C) / Time in seconds (s).

Question 33

What type of current flows only in one direction?

Answer 33

Direct Current.

Question 34

What is the standard symbol for resistance?

Answer 34

Ω (ohm).

Question 35

What is the total resistance of a circuit with resistors of 2Ω and 3Ω in series?

Answer 35

5Ω.

Question 36

What is the relationship between the four currents in a parallel circuit?

Answer 36

The four currents add to give the total current.

Question 37

What is the main disadvantage of series circuits?

Answer 37

When one component fails, the whole circuit fails.

Question 38

What happens to the brightness of bulbs in a series circuit when more are added?

Answer 38

They become dimmer.

Question 39

What is the relationship between the four voltages in a series circuit?

Answer 39

They add to equal the supply voltage.