principle is used to a resistor is in the form of heat. This by 3. (20 points to

Question

principle is used to a resistor is in the form of heat. This by 3. (20 points total) The You have an using simple liugh your homes use alternating current, we w calculations by using simple direct current circuits. You have an electric heater consisting of a 120 diagram below.c make an electric heatet. pwer dissipated by a resistor is in the for make an electric heater. Although your homesu tern ating current, we will simplify the or connected as shown in the ekilowat of power from the resistor heating element. What is the R- g of a 120 V battery and a resistor con a)(6 pts) The heater delivers 1.0 value of the resistor? Av power Vab 1 Vab p- 6) (6 pts) You want to prod battery to produce the following circuit. How much power does this arrangement dissipate ce more heat, so you get a second identical resistor, and use the same c) (6 pts) You now take the same battery and the same two resistors, and connect them as follows. How much power is dissipated by the arrangement now? or d) (2 pts) Which arrangement (b) or (c) has the resistors in series? 4. (3 points total) a) 3 pts) Which circuit from the previous problem (a), (b) or (c) requires the battery to produ most current? 3 of 6

Explanation / Answer

we know power dessipated is V2/R

so A

P = 1202/R

R = 14400/1000= 14.4 ohm

B.:

no R eq is

Req-1=R-1+R-1

Req= R/2

so P = V2/R

Power New will get double as R get Half and V remain same

Pnew= 2 KW

C.:

Req= 2R (resistance in series)

Power will get half as resistance get double

so Pnew= 500 watt

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