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Chapter 17: Direct current

Total questions: 71

Worksheet time: 2hrs 19mins

Name
Class
Date
1.

Which statement is FALSE about electricity?

a)

Electric current is defined as the rate of charge flow

b)

The resistance will increase when the temperature increase

c)

The electric current decreases when the resistance increases

d)

The resistivity increases when the length of the conductor increases

2.

If the resistor are connected in parallel in a circuit which one has the highest current?

 R1 < R2 < R3 < R4 R_1\ <\ R_{2\ }<\ R_3\ <\ R_4\   

a)

 R1R_1  

b)

 R2R_2  

c)

 R3R_3  

d)

 R4R_4  

3.

Which of the following parameter DOES NOT alter the electrical resistance of a piece of metal wire?

a)

The temperature of the wire

b)

The diameter of the wire

c)

The type of material of the wire

d)

The direction of the current flow in the wire

4.

If the length of the wire is doubled and its area of cross section is decreased to half, then its resistance

a)

Increased by 4 times

b)

Increased by 2 times

c)

will become half of its initial value

d)

Remains the same

5.

A battery is connected across a parallel combination of 2 identical resistor. If the potential difference across the terminals is V and the current in the battery is I, Then:

a)

The potential difference across each resistor is V and the current in each resistor is I

b)

The potential difference across each resistor is V/2 and the current in each resistor is I/2

c)

The potential difference across each resistor is V and the current in each resistor is 1/2

d)

The potential difference across each resistor is V/2 and the current in each resistor is I

6.
What is current measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
7.
What is resistance measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
8.
What is Resistance?
a)
The flow of electrons
b)
Electric potential difference
c)
A battery
d)
The ability to reduce the flow of electrons
9.
The mathematical relationship among Voltage, Current, and Resistance
a)
Faraday's Law
b)
Tesla's Law
c)
Edison's Law
d)
Ohm's Law
10.
Current times Resistance equals
 (I X R)
a)
Power
b)
Voltage
c)
Amperage
d)
Ohm
11.

Voltage divided by Resistance

(V / R)

a)

Current

b)

Power

c)

Ohms

d)

Watts

12.
If the Voltage is increased and the resistance stays the same, Current will
a)
Increase
b)
Decrease
c)
Stay the same
d)
X
13.
If the Voltage stays the same and Resistance is increased, Current will 
a)
Increase
b)
Decrease
c)
Stay the same
d)
X
14.

What is the formula for ohms law?

a)

1+2=3

b)

R X E = I

c)

V =I x R

d)

E= MC squared

15.
What is this symbol?
a)
resistor
b)
switch
c)
battery
d)
bulb
16.

What happens to the resistance of a resistor when the temperature is increased?

a)

Increases

b)

decreases

c)

stay the same

d)

vary randomly

17.
Factor which does not affect the resistance
a)
Type of material
b)
Length of material
c)
Mass of the material
d)
Area of the material
18.
which has the highest current flowing through it?
a)
R1
b)
R2
c)
R3
d)
All the same
19.
The unit to measure the resistivity of a wire is 
a)
ohms
b)
Volt 
c)
ohms.m
d)
ohms.s
20.
Materials that have a high electrical resistance
a)
less length
b)
less tempareture 
c)
more thickness 
d)
less cross sectional area
21.

What happens to resistance when the length of the wire increases?

a)

Stays the same

b)

Increases

c)

Decreases

22.

For the graph shown in the figure, what physical quantity does the slope of the graph represent for ohmic material?


a)

power

b)

resistivity

c)

resistance

d)

1/(resistance)

23.

Which circuit can be used to determine the electromotive force of a battery?

a)
b)
c)
d)
24.

S.I unit of e.m.f is ______?

a)

volt

b)

ampere

c)

ohm

d)

joules

25.

electromotive force is______?

a)

work done to by the source to drive a unit charge around a complete circuit.

b)

amount of light produced by a bulb

c)

amount of heat produced by a resistor

d)

amount of force produced by an electric motor

26.

unit of potential difference is____?

a)

volt

b)

ampere

c)

ohm

d)

newton

27.

Correct ( can be more than 1)

a)

 \epsilon=V+Ir  

b)

 \epsilon=I\left(R+r\right)  

c)

 ϵ=V\epsilon=V  

28.

How to you calculate the total resistance in a series circuit?

a)

R1 + R2+ R3

b)

R1 - R2 - R3

c)

1/R1 + 1/R2 + 1/R3

d)

R1 = R2 = R3

29.

How do you calculate total resistance in a parallel circuit?

a)

R1 + R2 + R3

b)

R1 - R2 - R3

c)

1/R1 +1/R2 + 1/R3 = 1/RT

d)

R1 = R2 = R3

30.

Which is a true statement?

a)

No sources of emf have internal resistance

b)

Some sources of emf have internal resistance

c)

Most sources of emf have internal resistance

d)

All sources of emf have internal resistance

31.

An ideal voltmeter in physics has...

a)

...an easily readable scale

b)

...an infinite resistance

c)

...zero resistance

d)

...a negligible internal resistance

32.

In Physics, an ideal ammeter has...

a)

...a 10A fuse

b)

...infinite resistance

c)

...an autoranging function

d)

...zero resistance

33.

The SI unit for EMF is

a)

JC-1

b)

VA-1

c)

ΩA-1

d)

VC-1

34.

 rr  

a)

emf

b)

p.d.

c)

internal resistance

d)

lost volts

35.

Which circuit diagram represents the correct way to measure the current in a resistor?

a)
b)
c)
d)
36.
The picture shows an electrical circuit. This circuit is a series circuit because: 
a)
It has 3 light bulbs.
b)
The same current flows through all three light bulbs.
c)
It uses a single battery.
d)
The electrical current is divided between the three light bulbs.
37.
As resistors are added in series to a circuit, the total resistance will...
a)
increase
b)
decrease
c)
stay the same
38.
As the resistance of a circuit increases, the current will...
a)
increase
b)
decrease
c)
stay the same
39.
In a parallel circuit which of the following is the same value throughout the circuit?
a)
Voltage
b)
Current
c)
Resistance
d)
Charge
40.
This is an example of a _______ circuit
a)
open
b)
series
c)
parallel
d)
square
41.
This is an example of a ______ circuit
a)
Series
b)
Parallel
c)
Open
d)
Dihexihedral
42.
what is this symbol for?
a)
light bulb
b)
switch
c)
battery
d)
resistor
43.

Conventionally, current is described as flowing from the ................ terminal of a battery to the ................ terminal.

a)

Negative.....negative

b)

Negative....positive

c)

Positive......negative

d)

Positive....positive

44.

This is the symbol for

a)

ammeter

b)

light bulb

c)

resistor

d)

voltmeter

45.

This is the symbol for

a)

ammeter

b)

light bulb

c)

resistor

d)

voltmeter

46.

Effective resistance increases when in .............. circuit.

a)

Parallel

b)

Series

c)

Open

d)

Closed

47.

Effective resistance decreases when in .............. circuit.

a)

Parallel

b)

Series

c)

Open

d)

Closed

48.

Current entering and leaving a point in a circuit should be

a)

equal

b)

decreasing

c)

increasing

d)

variable

49.

"The total current in a parallel circuit equals the sum of the individual branch currents."

a)

Ohm's Law

b)

Kirchhoff's Voltage Law

c)

Kirchhoff's Current Law

d)

Bolen's Law

50.

"The sum of all voltage drops in a series circuit equals the total applied voltage." This is know as what?

a)

Ohm's Law

b)

Kirchhoff's Voltage Law

c)

Kirchhoff's Current Law

d)

Bolen's Law

51.

For the circuit shown, the resistances are R1 > R2 > R3. What is true about the current through each resistor?

a)

I1 = I2 = I3

b)

I1 > I2 > I3

c)

I1 > I3 > I2

d)

I1 < I3 < I2

52.

Kirchhoff's 1st law deals with

a)

current in circuit

b)

voltage in circuit

c)

e.m.f in circuit

d)

voltage in circuit and e.m.f in circuit

53.

"The sum of all voltage drops in a series circuit equals the total applied voltage." This is know as what?

a)

Ohm's Law

b)

Kirchhoff's Voltage Law

c)

Kirchhoff's Current Law

d)

Bolen's Law

54.

P equals ...

a)

VI\frac{V}{I}

b)

ERER

c)

I2RI^2R

d)

V2RV^2R

55.
Watts is the same as...
a)
Joules per second
b)
Voltage per second
c)
Current per second
56.
Which appliance transfers the most energy per second? 
a)
Clock
b)
Lamp
c)
Desktop Computer
d)
Iron
57.

What type of circuit is this?

a)

series

b)

simple

c)

open

d)

parallel

58.

What kind of circuit is this?

a)

series

b)

parallel

c)

simple

d)

open

59.

Which one is true about potential divider

a)

It consists one fixed resistor

b)

It's resistors are connected in parallel to suply

c)

It's resistors connected in series to suply

d)

It's resistors connected in series and parallel to suply

60.

A potentiometer is a device used for

a)

measuring potential energy

b)

measuring resistance

c)

comparing potential difference

d)

comparing potential energy

61.

The Vout across the resistor of resistance R2 is given by:

a)

Vout = (R1/(R1+R2)) x Vin

b)

Vout = (R2 x (R1+R2)) x Vin

c)

Vout = (R2/ (R1+R2)) x Vin

d)

Vout = ( R1 x (R1 + R2))x Vin

62.

A current is said to exist whenever _____.

a)

A wire is charged

b)

A battery is present

c)

Electric charges are unbalanced

d)

Electric charges move in a loop

63.

The movement of electrically charged _____ is called electric _____

a)

particles, transport

b)

ions, current

c)

particles, current

d)

ions, transport

64.

Which of the following will cause an electrical current to decrease?

a)

The voltage stays the same

b)

Decrease the resistance

c)

Increase the voltage

d)

Increase the resistance

65.

Factor which does not affect the resistance

a)

Type of material

b)

Length of material

c)

Mass of the material

d)

Area of the material

66.

If the length of a wire increases, the resistance ____________

a)

Decreases

b)

Increases

c)

Stays the same

d)

Unknown

67.

What is internal resistance?

a)

The resistance inside the cell that increases with more current drawn from the cell

b)

The resistance inside the cell that decreases with more current drawn from the cell

c)

The resistance inside the cell that remains constant as the current drawn from the cell changes

d)

The resistance inside each component which increases as more resistances are added in series

68.

What is the principle of potentiometer ?

a)

V is proportional to L, when steady current flows through a wire of uniform area of cross section at constant temperature

b)

Deflection in G is proportional to current

c)

Resistance is proportional to length

d)

Resistance is inversely proportional to area of cross section

69.

What is the use of a potentiometer? (can be more than 1)

a)

1. comparison of emf's of two primary cells

b)

2. finding internal resistance of a cell

c)

3. can be used as a variable resistor

70.

ρ\rho has a unit of ..........

a)

Ω\Omega

b)

Ωm\Omega m

c)

Ωm2\Omega m^2

d)

Ωm3\Omega m^3

71.

we use  ρlA\frac{\rho l}{A}  to find .........

a)

 PP  

b)

 VV  

c)

 II  

d)

 ρ\rho  

e)

 RR  

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