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Electric Current and Potential Difference

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Electric Current and Potential Difference

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Questions and Answers

What is the main reason for the flow of electric current between two points?

The presence of a conductor between the two points

The presence of a resistor in the circuit

The potential difference between the two points (correct)

The presence of a cell or battery

What is the primary function of a cell or battery in a circuit?

To maintain a potential difference between its terminals (correct)

To decrease the voltage in the circuit

To increase the resistance in the circuit

To block the flow of electric current

What is the consequence of connecting a dry cell to a torch bulb through copper wires?

The copper wires melt due to excessive heat

The bulb does not light up

The dry cell is drained of its chemical energy

The bulb lights up due to the potential difference (correct)

What is a common source of potential difference or voltage?

A cell or battery Signup and view all the answers

What was the direction of electric current considered to be when electricity was first discovered?

From positive terminal of a cell to the negative terminal Signup and view all the answers

Why do electrons in a metal wire move at random directions when not connected to a source of electricity?

Because of the absence of a source of electricity Signup and view all the answers

What is the purpose of the chemical energy stored in a cell?

To maintain current in the external circuit Signup and view all the answers

What happens to the electrons in a metal wire when a source of electricity is connected?

They move from negative end to the positive end of the wire Signup and view all the answers

What is the actual flow of electrons in a wire?

From negative terminal to positive terminal of a cell Signup and view all the answers

What is the conventional direction of electric current?

From positive terminal of a cell to the negative terminal Signup and view all the answers

Electric Current and Potential Difference

Choose a study mode

Podcast

Questions and Answers

What is the main reason for the flow of electric current between two points?

What is the primary function of a cell or battery in a circuit?

What is the consequence of connecting a dry cell to a torch bulb through copper wires?

What is a common source of potential difference or voltage?

What was the direction of electric current considered to be when electricity was first discovered?

Why do electrons in a metal wire move at random directions when not connected to a source of electricity?

What is the purpose of the chemical energy stored in a cell?

What happens to the electrons in a metal wire when a source of electricity is connected?

What is the actual flow of electrons in a wire?

What is the conventional direction of electric current?

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