)How much current will be flowing through a 69m length of copper wire with radiu

Question

)How much current will be flowing through a 69m length of copper wire with radius6mm if it is connected to a source supplying 100 v? (The resistivity of copper is 1.68 × 10-8 ·m) 2) A component with a 17 resistor is rated for use at power levels not exceeding 4W How much current can safely flow through the component )A 6.0 V battery that can store 00ofenergy is connected to a resistor. How much electrical charge must flow between the battery's terminals to completely drain the battery if it is fully charged? 4 The resistors in the circuit shown in Figure 19.2 each have a resistance of 700 What is the equivalent resistance of the circuit? Figure 19.2 sA 10.0 V battery is connected across two resistors in series. If the resistors have resistances of 840.0 and 500.0 , what is the voltage drop across the resistor? Identical light bulbs are attached to identical batteries, as shown in Figure 19.7. The ranking (from lowest to highest) of the total power emitted from the light bulb(s) is Figure 19.7

Explanation / Answer

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1.

Area of Copper wire

A=Pi*r2=pi*(6.9*10-3)2=1.496*10-4 m2

Resistance of copper wire

R=pL/A =(1.68*10-8)*69/(1.496*10-4)

R=7.75*10-3 ohms

Current flowing through copper wire is

I=V/R=10/(7.75*10-3)=1290.3 A

2.

Current that can safely flow through the component is

I=sqrt(P/R)=sqrt(14/17)

I=0.9075 A

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