Answer:
Explanation:
Technician A is incorrect as in series circuit the current is the same for all the resistors and if one bulb fails in the path then the circuit is incomplete and therefore no flow of current.
Technician B is correct as in parallel circuit there are multiple paths for current through which it can pass and malfunctioning of one resistor does not affect the other.      
 
        
             
        
        
        
Answer:
13.52 Ω
Explanation:
coefficient of thermal resistance be α
R₀ , R₂₅ , R₉₀ and R₋₃₂ be resistances at 0 , 25 , 90 , and - 32 degree 
R₂₅ = R₀ + α x 25 
R₉₀ = R₀ + α x 90
R₉₀ - R₂₅ = 65 x α
α = (R₉₀ - R₂₅ )/ 65
= (14.55 - 14) / 65 
=   .55 / 65 Ω per °C,
R₂₅ = R₀ + α x 25 
14 = R₀ + (.55 / 65 )x 25
=  R₀ + .2115
R₀ = 13.7885 Ω
R₋₃₂ = R₀ - α x 32
= 13.7885 -(  .55 / 65) x 32 
=  13.7885 - .27077
= 13.51773 Ω
= 13.52 Ω
 
        
                    
             
        
        
        
Answer:
20 m/s
Explanation:
Distance covered by man =500m
Time taken by man=25 seconds
Speed of man = distance/time
= 500/25
=20 m/s