Pre Lab 4 - DC Circuits and Power 1. How would the equivalent resistance of a ci

Question

Pre Lab 4 - DC Circuits and Power 1. How would the equivalent resistance of a circuit change if another resistance, R, is Connected i) in series with the circuit? ii) in parallel with the circuit? [Hint: Recall the relation between resistivity and resistance and try thinking about a series-connection as ''adding more length'', and about a parallel-connection as ''adding more area] 2. A home appliance experiences a voltage drop of 4.0 V across it while a current of 4 Amperes flows through it. How much power does it dissipate? 3. A battery is rated that it provides 64 Watts of power at 20 V when fully charged. How much current can it deliver?

Explanation / Answer

here,

let the initial equivalent resistance of the circuit be Req

resistance of connected resistor is R

(a)

when R is in series with the circuit,

equivalenu resistance , R'eq = R + Req

when R is connected inh series, R is added to initial equivalent resistance to get the final equivalent resistance

(b)

when R is in parallel with the circuit,

equivalent resistance , R'eq = (R* Req)/(R + Req)

when R is connected in parallel , equivalent resistance = (R* Req)/(R + Req)

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