Electric Current

Question 1

When you stick a fork in an electrical outlet, what is it that can kill you?
The voltage drop
Your resistivity
The current flowing through you(Correct)
The power delivered

Answer 1

The current flowing through you

Question 2

If resistance of an electric bulb is 500 ohms and voltage across its ends is 250 V then power consumed by it is:
130 W
125 W
120 W
200 W

Answer 2

125 W

Question 3

What is the name of a material in which electrons are free to move?
Resistor
Conductor
Transistor
Insulator

Answer 3

Conductor

Question 4

What is the resistance of a 60 W light designed for your 120 V outlet?
2  ohms
60  ohms
120  ohms
240  ohms

Answer 4

240 ohms

Question 5

A copper wire conducts a current of 1 A when a potential difference of 120 V is applied across  its  length.   If  the  wire  is  cut  so  that  it  is  half  as  long,  how  much  current  will  it conduct with the same potential difference across of it?
0.5 A
1 A
2 A
4 A

Answer 5

2 A

Question 6

A copper wire consumes 10 W when a potential difference of 120 V is applied across its length.  If the wire is cut so that it is half as long, how much power will it consume with the same potential difference across of it?
2.5 W
5 W
10 W
20 W

Answer 6

20W

Question 7

A cylindrical conductor is placed in series with a source of constant current,I,  so that current  flows along the axis of symmetry of the cylinder.  If the radius of the cylinder is reduced by half of its original value, what happens to the current density in the conductor? It increases by a factor of 4.
It increases by a factor of 2
.It remains the same.
It is reduced by a factor of 2
.It is reduced by a factor of 4.

Answer 7

It increases by a factor of 4