2 2 components in series and parallel circuits

False. Current is the same everywhere in a series circuit.

True. In a parallel circuit, the current from the power source is larger than the current in each branch.

True. The amount of current flowing in any circuit depends on the voltage and resistance in the circuit.

True. Current is conserved at a junction in a parallel circuit because charge is always conserved.

False. Current will only split equally at a junction if the resistance in each branch is equal.

False. When several cells are connected in series, their combined voltage is the sum of their individual voltages.

The total voltage across the components in a series circuit is equal to the sum of the individual voltages across each component.

The total voltage across an arrangement of parallel resistances is the same as the voltage across one branch in the arrangement of the parallel resistances.

True. One advantage of a parallel circuit is that each bulb can be arranged in its own branch with its own switch.

False. An advantage of parallel circuits is that if components in one branch fail, the components in other branches will still work. If one component fails in a series circuit, then the circuit is broken and the current cannot flow.

When two or more resistors are connected in series, the combined resistance is the sum of the individual resistances.

True. The combined resistance of two resistors in parallel is less than that of either resistor by itself.

The equation for calculating the combined resistance of two resistors connected in series is Where:

Adding components to a circuit increases the total resistance of the circuit, so the current would decrease (for a constant voltage).

If the voltage of the power source is increased, but everything else in the circuit remains constant, the current will increase.

The gradient of an I-V graph represents the resistance of a component.

A linear I-V (current-voltage) graph shows

This is the I-V graph for a fixed resistor or a wire (at a constant temperature).

This is the I-V graph for a filament lamp.

This is the I-V graph for a diode.

False. As the current through a filament lamp increases, the resistance increases.

The resistance of a filament lamp increases as the voltage is increased because

The I-V graph for a diode shows they have

The resistance of a fixed resistor is constant, whereas the resistance of a variable resistor can be changed. The circuit symbol for a variable resistor has an arrow through it, whereas the symbol for a fixed resistor does not.

The five pieces of apparatus needed to investigate the relationship between current and voltage of a component are

A thermistor is a temperature-dependent resistor. This means its resistance changes depending on its temperature.

When the temperature of a thermistor is increased, its resistance decreases.

LDR stands for light-dependent resistor. This means its resistance changes depending on the intensity of light on it.

When light intensity on an LDR is increased, its resistance decreases. (Remember: Light Decreases Resistance - LDR)

For a thermistor, the relationship between resistance and temperature is

For an LDR, the relationship between resistance and light intensity is

An LED is a light-emitting diode. It is a type of diode, meaning it only allows current to flow in one direction.

True. Lamps and LEDs can be used to indicate the presence of a current in a circuit.