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Question:

What is the basic operation of a step-up transformer?

A It steps up the voltage and steps down the current.
explanation

The basic operation of a transformer is to step up or step down the voltage in the circuit. If the transformer is a step up then it will step up the voltage and step down the current to maintain the power (i.e. P=VI) in primary and secondary sides of the circuit.

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Related Questions

Which of the following statements is incorrect regarding a transformer?

Secondary current of a step-down transformer is less than its primary current.

A transformer is a static device so it has no mechanical losses. A transformer only transforms the voltage and the current and the frequency remains same during the transformation process. The power on primary side of an ideal transformer is equal to the power on the secondary side. The transformer is step-down then the voltage on secondary side must be less than the voltage on its primary side, which means that the current on secondary side must be higher than the current on its primary side.

The electric power consumed by an electric kettle is 2000 W. If the voltage being supplied to the kettle increases 4 times and the current flowing through the kettle is decreased by half, what would be the effect on the power consumed by the kettle?

The electric power would double.

The formula of finding electrical power is P=VI. If the voltage increases 4 times and the current flowing through the kettle becomes half then \(P = 4V \times \frac{\mathrm{1} }{\mathrm{2} }I = 2\) (PI). The electric power of the electric kettle would become double.

What does this symbol refer to?

piezo transducer

A transducer is any device used to convert energy from one form to another. Piezo transducers are often used in microphones where they convert sound pressure to electrical voltage.

The resistor color code for 2 is

Red

The band code for a resistor is as follows:
• Black is 0
• Brown is 1
• Red is 2
• Orange is 3
• Yellow is 4
• Green is 5
• Blue is 6
• Violet is 7
• Gray is 8
• White is 9

What type of switch is pictured above?

push-to-break

Pushing the button breaks the circuit. When you release the button it returns to its normally closed (on) position.

What are the three terminals of a transistor?

Base, Emitter, Collector.

A transistor has three connectors or terminals which are the base, the emitter and the collector. The flow of charge goes in the collector, and out of the emitter, depending on the charge flowing to the base.

How much current will flow through the resistor R2 if R1=R2=10 ohms and R3=20 Ohms?

1.5 amperes

The circuit in the given figure is a series circuit. We know that the same current flows through all the resistors connected in series. The equivalent resistance of the given circuit = R1+R2+R3 = 10+10+20 = 40 ohms. \(I = 60 \div 40 = 1.5\)

What is the load in this basic circuit model?

C

In a basic circuit model, there is a voltage source (pictured here as a battery at points A and B), a load, and conductors. The conductors are drawn using the lines and arrows. The load in this model is the light bulb pictured at point C. Examples of loads are light bulbs, resistors and motors.

How many valence electrons are present in most semi-conductor materials?

4

Most semi-conductor materials have four valence electrons making them neither good conductors nor good insulators. For example, silicon and germanium are both semi-conductors and they have four electrons in their valence shells.

Which of the following is NOT a characteristic of a step-up transformer?

the primary voltage is higher than the secondary voltage

As their names indicate, a step-up transformer is used to step up or increase voltage and a step-down transformer is used to step down or decrease voltage. In a step-up transformer, the secondary voltage is higher than the primary voltage and it has more turns in the secondary winding than in the primary winding.

If a circuit has 8 volts of power and 4 ohms of resistance, what will the current equal?

2 amps

Current is measured in amps. The formula to use here is:
\(I = \frac{\mathrm{V} }{\mathrm{R} } = \frac{\mathrm{8} }{\mathrm{4} } = 2\)

If an electrical circuit is interrupted, which of the following will result?

open circuit

A closed circuit is a complete loop or path that electricity follows. It consists of a source of voltage, a load, and connective conductors. If the circuit is interrupted, if a wire is disconnected or cut for example, it becomes an open circuit and no electricity will flow.

Which of the following statements are correct regarding a Voltmeter?

A voltmeter is used in parallel to a circuit.

A voltmeter is used to measure the potential difference between two points. It is used in parallel with a circuit when measuring voltage. Ideally a voltmeter should have high resistance so that no current flows through it while measuring the potential difference between the two points.

What type of electrical circuit is depicted below?

series-parallel circuit

A series-parallel circuit has some loads wired in series and some loads wired in parallel. The loads in this circuit are R1, R2, and R3. R1 is wired in series while R2 and R3 are wired in parallel.