Multiple-Choice Homework Problem 13.5 You are building an electric heater. You h

Question

Multiple-Choice Homework Problem 13.5 You are building an electric heater. You have a 20V power supply and wish to produce 100 J s . How much current must flow through the device? Select One of the Following: (a) 1/5A (b) 5A (c) 20A (d) 100A (e) 2000A

Multiple-Choice Homework Problem 13.6 You have two resistors of resistance 1 and 2. What is the complete set of possible resistances you can form by either using one or both of the resistors? Select One of the Following: (a) 1, 2, 3 (b) 1, 2, 3, 1/2 (c) 1, 2, 3, 1/2, 3/2 (d) 1, 2, 2/3 (e) 1, 2, 3, 2/3

Explanation / Answer

a) let current through device be I

Energy = V*I

100 = 20*I

I = 5 ampere

b)

we can make 1 ohm and 2 ohm

also when both are connected in series we can make 1+2 = 3 ohm

when connected in parallel we can make 1*2/3 = 2/3 ohm

hence option e is correct

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