Electronics and Robotics

Question 1

Electric charge

Answer 1

A flow of electrons

Question 2

Current

Answer 2

It is a flow of electrons. It is the amount of electrons “running” around the circuit. Current is measured in Amps, with an ammeter. The symbol for current is ‘I’.

Question 3

Voltage

Answer 3

is a measure of how much energy the electrons have.

• Voltage is measured in volts, by a voltmeter.
• A voltmeter is connected in a parallel circuit

Question 4

Conventional flow

Answer 4

assumes that current flows out of the positive terminal, through the circuit and into the negative terminal of the source.

Question 5

What is electrical charge measured in?

Answer 5

Coulombs per second

Question 6

Series circuit

Answer 6

The lights are dimmer in a series circuit with two or more bulbs because the electrons have to supply power to more than one bulb.

Question 7

Parallel circuit

Answer 7

The lights are at normal brightness in a parallel circuit with two or more bulbs because the electrons are able to split and supply the same amount of electricity to each light bulb.

Question 8

Resistance

Answer 8

• A resistor slows (or reduces) the current.
• The more resistors the more resistance.
• Resistance slows the flow of current

Question 9

What is 1 coulomb?

Answer 9

6.25 billion billion electrons

Question 10

To find voltage:

Answer 10

Voltage = current x resistance
V = I x R

Question 11

To find power:

Answer 11

Power = current x voltage
P = I x V

Question 12

Diode

Answer 12

A device that allows current to flow in one direction only.

Question 13

Power is measured in:

Answer 13

Watts (W)

Question 14

Current is measured in:

Answer 14

Amps (A)

Question 15

Voltage is measured in:

Answer 15

Volts (V)

Question 16

Resistance is measured in:

Answer 16

Ohms