How should the student change the circuit to give negative values for current and potential difference?

The student can reverse the direction of current flow in a circuit to obtain the negative values for current and potential difference in the circuit.

To determine the negative current flow and potential difference in a circuit, we can consider following ways;

Thus, the negative values of current and potential difference is obtained by reversing the direction of current flow in a circuit.

Learn more about current and potential difference here:

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Please find the answer in the explanation.

Explanation:

How should the student change the circuit to give negative values for current and potential difference?

Positive and Negative current can be seen when charging and discharging a device or when powering a load.

Negative current can also be achieved when current is allowed to flow in other direction.

If the direction of the current is changed, the voltage will read negative. Changing of power or battery terminals can make voltmetre to read negative.

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.