Practical Electrical and Electronic Circuits

Question 1

Rule for current in series

Answer 1

Same at all points

Question 2

Rule for current in parallel

Answer 2

Sum of the current through each branch is equal to the current through the supply

Question 3

Rule for voltage in series

Answer 3

Voltage is shared between components (Supply voltage is equal to the sum of voltages across all components)

Question 4

Rule for voltage in parallel

Answer 4

Voltage across each branch is equal to the supply voltage

Question 5

cell

Answer 5

supplies energy to the circuit

Question 6

battery

Answer 6

two or more cells joined together

Question 7

lamp

Answer 7

converts electrical energy to light

Question 8

switch

Answer 8

completes and breaks a circuit

Question 9

resistor

Answer 9

converts electrical energy to heat. Controls current.

Question 10

LED

Answer 10

light emitting diode. converts electrical energy to light. must have protective resistor connected in series.

Question 11

relay

Answer 11

consists of a coil and a switch. when current flows through the coil, a magnetic field closes the switch. (converts electrical energy to kinetic.)

Question 12

transistor

Answer 12

an electronic switch. switches on if the voltage across it is greater than 0.7 V