# Electrical Circuits Basics.

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• #10906

I’ll be grateful to the learned members here to know a few extremely basic electrical circuits concepts.

1. What is difference between electrical circuit and electrical system.

2. How does current varies with voltage drop in a resistive circuit?

To elaborate my query; suppose there is a resistive electrical circuit with 2 resistors connected in series. If i take readings with a voltage measuring instrument at any point (i) before first resistor (ii) between first and second resister (iii) and after second resister. We will observe a drop in voltage in the process from (i) to (iii).

Here i wish to know; with drop in voltage across resisters,will there also be drop in current across resisters. I ask so because since voltage is the driving source of current and so with drop in voltage across resister there should be drop in current value across resisters.

#13195

1. Any small or big closed ntw can be called electrical ckt, where as electrical system usually consists of many ckts.
e.g. a bulb connected to a battery and the whole power grid.

2. In series ckt current flowing through various components is equal. The voltage is always measured between 2 pts. and whenever current flows through a resistor there is a voltage drop. So yeah when u ll  observe a drop in voltage in the process from (i) to (iii).

there ll be voltage drop but the current ll remain same.

#13196

Regarding ur doubt abt the voltage and current, when u ll be completing the ckt u ll , of course be joining one or more voltage source, it is this voltage source/s which will be driving the current through the ckt. What is resistance? it is nothing but the property of the element to resist the flow of charges through it, right? So when ever current flows through it there is a corresponding voltage drop (V=IR).
i hope this solves ur problem

#13198

Thank you very much Aakash. I got it this way:

1. Voltage is the driving source in any closed circuit.

2. Due to resistances there will be drop in effective voltage to draw current in closed circuit; because some voltage will be absorbed by resistances or it can be said that resistances will drop  some voltage across them.

3. According to relation V=IR; since net potential difference in a circuit (i.e. voltage (D.C.)) is constant; increase in resistance in circuit reduces net current in circuit to makeup for the above relation and on reduction in circuit resistance there will be rise in current.

4. In any circuit with any fixed battery source and resistances; current at any point in the closed circuit will be same. The potential drop in circuit can be seen to consume some voltage across circuit terminals in form of potential drop across them.

5. If we imagine a circuit with zero resistance; any potential difference across closed circuit will draw infinite current. That is magnitude to potential difference in closed circuit becomes irrelevant to limit the flow of current in a resistance-less circuit.

Please correct me if i’m wrong somewhere.

#13199

Yeah Prateek u get it right.

#13203

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#13208

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