When a voltmeter is connected to a circuit, it measures the electrical potential difference (voltage) across two points in that circuit. If the specified voltage across these two points is indicated as 7 VDC (volts direct current), the voltmeter should ideally read this same value, given that no other factors such as load interference or improper connections affect the measurement.
In an ideal scenario, the voltmeter does not draw significant current from the circuit, meaning it does not alter the voltage it is measuring. Therefore, when correctly placed in a circuit with a voltage supply of 7 VDC, the expected reading on the voltmeter would be exactly 7 VDC. This is a fundamental principle in electronics, where the readings obtained should reflect the actual voltage present in the circuit without alteration.