[Virtual Laboratory - Home Automation and Telecommunications] This is the reason why the Reed Switch level sensor is used in conjunction with a con...
[Virtual Laboratory - Home Automation and Telecommunications] This is the reason why the Reed Switch level sensor is used in conjunction with a contactor when a water pump is activated. Regarding the above, choose the CORRECT alternative:
A It is necessary to balance the currents for the sensor to function properly.
B This type of sensor supports loads above 20 W. Since it is normally powered with nominal voltage (110/220 V), the supported current is around 2 A/1 A. Since it is a current above the value of a lamp current, the contactor could be omitted.
C A contactor is used for practical reasons, the load could be directly activated by the sensor.
D This type of sensor does not support loads above 20 W. Since it is normally powered with nominal voltage (110/220 V), the supported current is around 200 mA/100 mA. Since it is a very low current, it would not support the direct activation of loads.
A It is necessary to balance the currents for the sensor to function properly.
B This type of sensor supports loads above 20 W. Since it is normally powered with nominal voltage (110/220 V), the supported current is around 2 A/1 A. Since it is a current above the value of a lamp current, the contactor could be omitted.
C A contactor is used for practical reasons, the load could be directly activated by the sensor.
D This type of sensor does not support loads above 20 W. Since it is normally powered with nominal voltage (110/220 V), the supported current is around 200 mA/100 mA. Since it is a very low current, it would not support the direct activation of loads.
💡 1 Resposta
Ed 
A alternativa correta é a letra D. Esse tipo de sensor não suporta cargas acima de 20 W, pois a corrente suportada é em torno de 200 mA/100 mA. Como essa corrente é muito baixa, o sensor não seria capaz de ativar diretamente as cargas. Por isso, é necessário utilizar um contatores para realizar a ativação das cargas.
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