The trolleybus moves uniformly along the horizontal section of the track at a speed of 36 km / h.

| January 11, 2021 | education

The trolleybus moves uniformly along the horizontal section of the track at a speed of 36 km / h. The resistance force acting on the trolleybus is 2200 N. Find the efficiency if the current is 50 A and the voltage across the terminals is 550 V.

The efficiency of the trolleybus is calculated by the formula:
η = (A / Q) * 100%, A is the value of the perfect work by the trolley bus (A = F * V, where F is the resistance force acting on the trolley bus (F = 2200 N), V is the speed of the trolley bus (V = 36 km / h = 36 * 1000/3600 = 10 m / s)), Q is the energy expended by the trolleybus (Q = U * I, where U is the voltage at the terminals (U = 550 V), I is the current strength (I = 50 A) ).
Let’s calculate the efficiency of the trolleybus:
η = (A / Q) * 100% = (F * V / (U * I)) * 100% = (2200 * 10 / (550 * 50)) * 100% = 0.8 * 100% = 80% …
Answer: The efficiency of the trolleybus is 80%.



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