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ok , i think i got itKavik said:You have to simplify one branch at a time where resistors are clearly either in series or parallel. Starting at the left branch, it begins to simplify like so:
[1] Recognize that the two 3Ω resistors are in series, add them: 3Ω + 3Ω = 6Ω. Replace that resistor in next step.
[2] With the new 6Ω resistor in place we now recognize that it is in parallel with the AD 6Ω resistor, so we do the math to simplify them: 6Ω || 6Ω = 3Ω
[3] The 3Ω resistor replaced the previous parallel ones.
With these simplifications we see that the "arm ADE" is actually the equivalent of two 3Ω resistors in series, thus 6Ω.
Also, I don't like how your book uses phrases like "Therefore Effective Resistance between A and E is given by." This is confusing, as it is only one path between points A and E, NOT the equivalent resistance. The true effective resistance between A and E would be when all resistors in the diagram are simplified down to one resistance (with respect to A and E, e.g. when all that remains is one resistor in between point A and point E).
Hope that helps.
Electricity is a broad term that refers to the flow of electric charge. Current, on the other hand, specifically refers to the rate at which electric charge flows through a circuit or conductor. In other words, electricity is the overall concept, while current is a specific measurement of that flow.
Current is measured in units called amperes (A), which is defined as the amount of electric charge passing through a specific point in a circuit in one second. This measurement is typically done using a device called an ammeter, which is placed in series with the circuit to measure the flow of current.
The flow of current can be affected by several factors, including the voltage of the power source, the resistance of the circuit, and the type of material the circuit is made of. Additionally, the temperature and length of the conductor can also impact the flow of current.
Current and resistance have an inverse relationship, meaning that as one increases, the other decreases. This is described by Ohm's Law, which states that the current flowing through a conductor is directly proportional to the voltage and inversely proportional to the resistance of the circuit.
Electricity travels through a circuit in a closed loop, starting from the power source (such as a battery or power outlet), through the conductors and components in the circuit, and back to the power source. This flow of electricity is made possible by the movement of electrons, which are negatively charged particles found in atoms.