| 摘要 |
The electrical circuit for driving a load comprises a transistor ( 12;14;22 ) having a load current flowing therethrough, a measurement device ( 30,32 ) for determining the voltage drop across this transistor ( 12;14;22 ), a device ( 42 ) for impressing a measuring current into the transistor ( 12;14;22 ), and a device for determining the resistance value of the transistor ( 12;14;22 ) in its ON state, this resistance value being between a known maximum value (R<SUB>XMAX</SUB>) and a known minimum value (R<SUB>XMIN</SUB>). The device for determining the resistance value is provided with a measuring bridge ( 36 ) having the transistor ( 12;14;22 ) and a known reference resistor (R<SUB>R</SUB>) arranged in its first bridge arm ( 38 ) and having three respectively known resistors (R<SUB>1</SUB>,R<SUB>2</SUB>,R<SUB>3</SUB>) arranged in its second bridge arm ( 40 ).
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