Unit 5 - Electricity

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The formula to calculate power in an electrical circuit is __________ = Voltage x Current.

Power.

The relationship between current and voltage is represented by __________.

Ohm's Law.

In a __________ circuit, the current remains constant while the voltage may vary.

Constant current.

The slope of the current-voltage graph represents __________.

Conductance.

The resistivity of a material is measured in __________.

Ohm-meters.

The equation for resistivity is __________ = Resistance x Area / Length.

Resistivity.

Conductors have low resistivity, while insulators have __________ resistivity.

High.

Temperature generally affects resistivity, increasing for __________ materials as temperature rises.

Conductive.

Resistivity can vary significantly between different materials, such as metals, semiconductors, and __________.

Insulators.

The total resistance in a series circuit is the __________ of all resistances.

Sum.

The device used to interrupt the flow of electrical current in a circuit is called a __________.

Switch.

A potential divider is used to divide __________ between two or more components.

Voltage.

In a potential divider, the __________ is the variable that can change to adjust the output voltage.

Resistance.

When resistors are connected in series in a potential divider, their total resistance is __________.

The sum of the individual resistances.

The potential difference across the terminals of a battery when no current is flowing is called __________.

Open-circuit voltage.

The internal resistance of a battery affects the __________ delivered to the external circuit.

Current.

When a load is connected to a battery, the actual voltage across the load is less than the EMF due to __________.

Internal resistance.

The equation to calculate the terminal voltage (V) in a circuit with internal resistance is __________ = EMF - I x r.

Terminal Voltage.