Suppose you are doing a physics lab that asks you to put a resistor into a circuit, but all the resistors supplied have a larger resistance than the requested value. How would you connect the available resistances to attempt to get the smaller value asked for?
By connecting the resistance in parallel we can get a smaller value from the larger resistances.
The term "circuit" refers to a set of electrical connections.
Circuits are closed-loop or route systems that consist of a network of electrical components through which electrons can travel.
Equivalent Resistance in series
Equivalent Resistance in parallel
Let the available resistances be and so on.
Equivalent resistance in series is given:
Equivalent resistance in parallel is given:
The equivalent resistance in series is more than any of the available resistance, and the equivalent resistance in parallel is greater than any of the available resistance, according to the equivalent resistance formula. As a result, to reduce the resistance value, we must connect the available resistances in parallel.
Therefore, the available resistors must be connected in parallel.
A flashing lamp in a Christmas earring is based on an RC discharge of a capacitor through its resistance. The effective duration of the flash is 0.250 s , during which it produces an average 0.500 W from an average 3.00 V (a) What energy does it dissipate? (b) How much charge moves through the lamp? (c) Find the capacitance. (d) What is the resistance of the lamp?
A person with body resistance between his hands of accidentally grasps the terminals of a power supply. (Do NOT do this!) (a) Draw a circuit diagram to represent the situation.(b) If the internal resistance of the power supply is , what is the current through his body?(c) What is the power dissipated in his body?(d) If the power supply is to be made safe by increasing its internal resistance, what should the internal resistance be for the maximum current in this situation to be 1.00 mA or less?(e) Will this modification compromise the effectiveness of the power supply for driving low-resistance devices? Explain your reasoning.
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