試題詳解

89. Cellphone is a common device in people’s daily life. When it runs out of power, people need to recharge it. The common scheme is to use a charger, which intakes 110 volt and provides roughly how many volt output to the cellphone？
(A)0.05 Volt
(B)0.5 Volt
(C)5.0 Volts
(D)50 Volts