Question

connect eight 3 ohm resistors to get an effective resistance of 3.8 ohms​

Answer 1

Answer:

answer is 0.54 ohms ..... I have checked in one book in mcq

Explanation:

i hope it helps you

Answer 2

Explanation:

MeneerNask

Mar 1, 2017

Answer:

Since they are parallel, the voltage is the same for all resistors.

Explanation:

Second question:

U

=

I

2

×

R

2

=

4

A

×

9

Ω

=

36

V

First question:

You could use

1

R

=

1

R

1

+

1

R

2

+

1

R

3

=

1

18

+

1

9

+

1

6

=

1

3

→

R

=

3

Ω

Or:

You can calculate the currents through the other resistors, add them all up and recalculate the total resistance (voltage already calculated):

I

1

=

U

R

1

=

36

V

18

Ω

=

2

A

I

2

=

4

A

(as given)

I

3

=

U

R

3

=

36

V

6

Ω

=

6

A

Now

R

=

U

I

=

36

V

2

A

+

4

A

+

6

A

=

36

V

12

A

=

3

Ω