Oceanic currents are driven by three main factors:

• The rise and fall of the tides. Tides create a current in the oceans, which are strongest near the shore, and in bays and estuaries along the coast.
• Wind. Winds drive currents that are at or near the ocean’s surface.
• Thermohaline circulation.

The collisions of electrons with other atoms and electrons is the reason for the resistance in the path of current inside a conductor. With the increase in temperature the time between successive collisions decreases hence the drift speed decreases and we say that Resistance increases. 0.

Cards

Resistance can be both good and bad. If we are trying to transmit electricity efficiently from one place to another through a conductor, resistance is undesirable in the conductor. However, it is resistance that allows us to use electricity for heat and light.

The effective resistance between vertices a and b (after connecting a voltage source between them) is defined as the potential difference between a and b per unit net current from a to b. In other words, Rab = va vb Iab .

The sum of the current in each individual branch is equal to the current outside the branches. The equivalent or overall resistance of the collection of resistors is given by the equation 1/Req = 1/R1 + 1/R2 + 1/R3 …

The equivalent resistance is where the aggregate resistance connected either in parallel or series is calculated. Essentially, the circuit is designed either in Series or Parallel. Electrical resistance shows how much energy one needs when you move the charges/current through your devices.

However, if you had a huge and complicated circuit with many resistors, then the effective resistance is the total resistance of the circuit. Effective resistance is usually measured between 2 points. In the figure above, the effective resistance is generally defined as the total resistance across the battery.

Lesson Summary More resistance means less current is flowing through the circuit. Equivalent resistance is a different way of indicating ‘total’ resistance, which we calculate differently for series and parallel circuits. In a series circuit, the different components are connected in a single, continuous loop.

When resistors are connected in parallel, more current flows from the source than would flow for any of them individually, so the total resistance is lower.

How to Use the Equivalent Resistance Calculator?

1. Step 1: Enter the resistance value separated by the comma, number of resistors and connection type in the respective input field.
2. Step 2: Now click the button “Submit” to get the resistance.
3. Step 3: Finally, the equivalent resistance will be displayed in the output field.

The two resistances R1 and R2 of 4 ohms are in series therefore their equivalent resistance,

1. R’ = 4 Ω + 4 Ω = 8 Ω
2. Now the resistances R’, R3 and R4 are in parallel so the equivalent resistance of the circuit would be.
3. Therefore the equivalent resistance between the two points A and B in the given circuit is 1.85 Ω.

3Ω

Now all the resistance between the points A to D becomes in series, Hence, we can add all of them and get the final equivalent resistance. Hence, we can conclude that option (C) R=30Ω is the correct answer.

Now, 5Ω,56​Ω and 3Ω are connected in series,so their equivalent resistance is given by : R=Req​+5Ω+3Ω=548​Ω→ equivalent resistance between A and B.