Question

A 2 Ω resistor is connected in series with a circuit which conduct 4 A current. Then the current will....​

Answer 1

Step 1: Find the equivalent resistance of the Circuit.

Given: Two resistors R

1

& R

2

are connected in series.

So, equivalent resistance can be given as:

R

net

= R

1

+ R

2

R

net

= 2 + 4= 6Ω

Step 2 : Find the current through 4Ω resistor

Since both resistors are connected in series so current through

each resistor is same as the current through the circuit.

Current=

Net resistance

P.D.

I=

6

6

=1A

Step 3: Heat dissipated through 4Ω resistor can be given as :

H=I

2

Rt

where, H= Heat dissipated, R= Resistance and t= time in seconds

So, H=1

2

×4×5=20J

Final Step : Heat dissipated through 4Ω resistor in 5 sec is 20 J.

Answer 2

Current in 2 Ω resistor is 4 Amperes.

Explanation:

An electrical circuit is a closed path that includes all the components connected to complete the flow of current.

Connection of electrical components can be in two ways: Series connection and Parallel connection.

Series connection

• In series connection, components have one common node.
• It is a connection where components are connected from end to end in a straight line.
• Current flowing through all these components in series is equal and same for all of them.
• If three resistors are connected in series in a circuit with total current of 2 Ampere, then current will be same for all the three resistors i.e. 2 Amperes in each of the three resistors.

Parallel connection

• In parallel connection, components have two common nodes.
• It is a connection where components are connected across each other's lead.
• Current gets divided in parallel connection but voltage across each of the parallel components is the same.

Here, current in 2 Ω resistor is 4 Amperes.