Chapter 18 - D.C.Circuit

Question 1

Current in a series circuit is not the same, Yes/No

Answer 1

No, same

Question 2

In a series circuit, the total voltage of the battery or the terminal is equal to ?

Answer 2

The SUM of the voltage of all the bulbs/component

V=V1+V2+V3

Question 3

In a series circuit, the battery has a voltage of 6V. There are three bulbs in the circuit. How much voltage will each bulb have?

Answer 3

Since V=V1+V2+V3, 6V/3=2V, each bulb receive 2V

Question 4

In a parallel circuit, the voltage of each bulb is not the same

Answer 4

No, same

Question 5

In a parallel circuit, the total current of the circuit is equal to ?

Answer 5

the SUM of the current of all the juntions, A=A1+A2+A3

Question 6

In a parallel circuit, the current of the circuit is 3A. There are three junctions, how much current will each junction receive?

Answer 6

Since A=A1+A2+A3, 3=1+1+1, each junction will receive 1A

Question 7

In a series circuit, there is 3 resistors of 1Ω each, what is the total resistance of the circuit?

Answer 7

since R=R1+R2+R3, total resistance is 3Ω

Question 8

In a parallel circuit, there is 3 resistors of 2Ω, each at one junction, what is the total resistance of the circuit?

Answer 8

since 1/R=1/R1+1/R2+1/R3, the total resistance will be 1.5Ω

Question 9

In a series circuit, there is two resistors, to calculate the voltage of one of the resistor, the equation is V1 = ?

Answer 9

R1/R1+R2 x V (Voltage of the source)

Question 10

Two resistors are connected in series, R1 = 2Ω, R2=5Ω, will they get the same voltage? If not, which one gets a higher voltage?

Answer 10

R2 get higher voltage

Question 11

What is Transducers? What does it do?

Answer 11

Transducers are electrical devices that convert energy from one form to another

Question 12

What are the two types of transducer? What is the difference between them?

Answer 12

Input transducer and Output transducer.

Input transducer convert non-electrical energy to electrical energy

Output transducer convert electrical energy to non-electrical energy

Question 13

What are the examples of Input transducer and output transducer?

Answer 13

Input transducer: Thermister and Light-dependent resistor

Output transducer: Loudspeaker

Question 14

A thermistor is a resistor whose resistance is affected by ____. When ______ increases, resistance ____.

Answer 14

Temperature, Temperature, Decrease

Question 15

A Light-Dependent Resistor (LDR) is a resistor whose resistance is affected by _____. When ______ is presented, the resistance ________

Answer 15

Light, Light, Decrease

Question 16

A resistor is connected to a series circuit. After that, a copper wire is connected to the circuit, making it a parallel circuit. How would the current flow through the circuit now? And why?

Answer 16

The current will flow through the copper wire instead because it is a short circuit.

Question 17

in a parallel circuit, there are two resistors, 1Ω and 4Ω respectively. The total current is 2A, how much current pass through the 1Ω resistor? Think of the current divider formula to solve

Answer 17

Since Current1= Current (Total) X R1/R1+R2, The current pass through 1Ω resistor is 0.40A

Question 18

Initially, in a parallel circuit there are 3 identical bulbs, later on, one bulb is removed from the circuit, what will happen to the brightness of the bulb as well as the total current of the circuit?

Answer 18

Brightness; Unchanged

Current: Decrease