Free problems arranged by topic
 Kinematics Dynamics Conservation laws Thermodynamics Waves Electricity Magnetism Optics Fluids and elasticity Ideal gas AC current

 Free problems: all problems
 Kinematics Dynamics Conservation laws Thermodynamics Waves Electricity Magnetism Optics Fluids and elasticity Ideal gas AC current

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# Physics problems:electricity

Problem 73.

What is the equivalent resistance between points A and B?

Solution

We can see that the resistors 20 ohm, 20 ohm, and 20 ohm are connected in series (see figure below). We replace these resistors by an equivalent resistor with the resistance of

Then we get the circuit shown in the figure below.

In this circuit two resistors 10 ohm and 10 ohm are connected in series. We can replace them with an equivalent resistor with the resistance of (see figure below)

Finally, we have three resistors (60 ohm, 20 ohm, and 30 ohm) connected in parallel (see figure below). The equivalent resistance of these resistors can found from the following expression

Then the equivalent resistance of the circuit is 10 ohm.

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