| 摘要 |
PURPOSE:To attain miniaturization and to make it possible to know a current, a power, a rate, etc. for each plug socket, by using a power meter wherein a magnetoresistance element is employed. CONSTITUTION:Diagonal vertexes 8a, 8b of one pair of the vertexes in a group 8 of magneto-resistance elements are connected in parallel to a power supply source 5 and a voltage of the supply source 5 is impressed on the diagonal vertexes 8a, 8b. When a load current flows through a magnetic field generating means 7 and 8 and a magnetic field is impressed on 8-1 and 8-2 out of the elements 8-1-8-4, resistance values thereof are varied. Therefore the balance of a bridge breaks and an output corresponding to the voltage of the supply source 5 is generated at a terminal 9. Variations in the resistance values of the elements 8-1-8-4 are proportional to a current flowing through a load 6, and the balance of the bridge connection breaks due to the variations, causing a variation in the voltage. Therefore the output of the terminal 9 is in proportion to the product of the current flowing through the load 6 and of a voltage at the opposite ends thereof, and thus a load power can be measured. |
