Question

The current in a 6.0 V device is 0.15 mA. In half an hour of operation,  C of charge flows in the circuit and  J of energy is delivered to the circuit.

Answer 1

Solution :

Given :

V = 6 V

I = 0.15 mA = 150 A

and, time (t) = half an hour = 30 min = 1800 sec

Since : I = Q / t

Thus : Q = I t = (150 A)(1800 sec) = 270000 C = 2.7 x 10⁵ C

And, Energy = V I t = (6 V)(150 A)(1800 s) = 1.62 x 10⁶ J

Therefore:

• The current in a 6.0 V device is 0.15 mA. In half an hour of operation, 2.7 x 10⁵ C of charge flows in the circuit and  1.62 x 10⁶ J of energy is delivered to the circuit.

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