Understanding Electric Current

What is Ohm's Law formula?

• I = V + R

• V = R / I

• V = I * R

• R = V - I

In a series circuit, how does the current behave?

• The current is zero in a series circuit.

• The current is the same at all points in a series circuit.

• The current varies at different points in a series circuit.

• The current is higher at the beginning of the circuit.

What is the main difference between conductors and insulators?

• Conductors allow current to flow; insulators resist current flow.

• Insulators allow current to flow; conductors resist current flow.

• Conductors are always made of metal; insulators are always made of plastic.

• Conductors and insulators have the same electrical properties but differ in appearance.

What happens to the total resistance in a series circuit when more resistors are added?

• The total resistance decreases.

• The total resistance remains the same.

• The total resistance fluctuates randomly.

• The total resistance increases.

How does a parallel circuit affect the voltage across each component?

• The voltage is only present across the first component in the circuit.

• The voltage across each component is halved compared to the total voltage.

• The voltage varies depending on the resistance of each component.

• The voltage across each component in a parallel circuit is equal to the total voltage supplied.

What is the effect of electric current on a light bulb?

• Electric current heats the filament in a light bulb, causing it to emit light.

• Electric current cools the filament, dimming the light.

• Electric current changes the color of the light bulb to blue.

• Electric current causes the bulb to explode immediately.

Which material is a good conductor of electricity?

• Wood

• Copper

• Glass

• Rubber

What happens to the current in a parallel circuit if one branch is disconnected?

• The current in the other branches decreases.

• The current in the disconnected branch is redirected to another branch.

• The total current increases significantly.

• The current in the other branches remains unchanged.

What is the role of a fuse in an electric circuit?

• To increase the voltage in the circuit.

• To store electrical energy for later use.

• To convert AC to DC power.

• The role of a fuse in an electric circuit is to protect against overcurrent by breaking the circuit when the current exceeds a safe level.

How does electric current affect a magnet?

• Electric current only affects permanent magnets.

• Electric current has no effect on magnets.

• Electric current weakens the magnetic field.

• Electric current generates a magnetic field around the conductor.