Free Printable Tech Basics

1.

A resistor can be put in a circuit to ...

a)

(a) convert AC to DC

b)

(b) reduce the current

c)

(c) increase the current

d)

(d) keep the potential difference

2.

Ohm’s Law is

a)

(a) V=W/R

b)

(b) V=R/I

c)

(c) V=I/R

d)

(d) V=IR

3.

A Potential Difference drives current around a circuit and is measured in

a)

(a) Amps

b)

(b) Volts

c)

(c) Ohms

d)

(d) Watts

4.

If a mobile rig draws 60 Watts from the 12V car battery, the current drawn is

a)

(a) 720mA

b)

(b) 5A

c)

(c) 720W

d)

(d) 72A

5.

The mains electrical supply in the UK is nominally

(a) 12V DC (b) 110V AC (c) 230V DC (d) 230 AC

a)

(a) 12V DC

b)

(b) 110V AC

c)

(c) 230V DC

d)

(d) 230 AC

6.

The frequency of an AC waveform, whose positive peaks occur every millisecond, is

a)

(a) 1Hz

b)

(b) 1kHz

c)

(c) 1MHz

d)

(d) 1GHz

7.

If the moon is 330,000 km above the earth, how long will it take for my radio signal to bounce back to earth?

a)

(a) 1.1 sec

b)

(b) 2.2 sec

c)

(c) 1.1 min.

d)

(d) 3.3 min.

8.

A simple circuit powered by a 9v battery has a LED in series with a 350 Ohm resistor. If the PD across the resistor measures 7v, the PD across the LED is ..

a)

(a) 2V

b)

(b) 7V

c)

(c) 9V

d)

(d) 16V

9.

In the simple circuit above, the current through the LED is about

a)

(a) 50mA

b)

(b) 40mA

c)

(c) 25mA

d)

(d) 20mA

10.

The circuit symbol for a fuse is

(a) a cross in a circle (b) a rectangle (c) a rectangle with a line through (d) a rectangle sandwiched between two lines

a)

(a) a cross in a circle

b)

(b) a rectangle

c)

(c) a rectangle with a line through

d)

(d) a rectangle sandwiched between two lines

11.

How much power does the radio take from a 12 volt car battery if the connecting wires draw 4 Amps

a)

(a) 3 Watts

b)

(b) 4 Watts

c)

(c) 12 Watts

d)

(d) 48 Watts

12.

The colour code for a 12k resistor is

(a) brown, black, red (b) black, brown, red (c) brown, red, orange (d) brown, red, red

a)

(a) brown, black, red

b)

(b) black, brown, red

c)

c) brown, red, orange

d)

(d) brown, red, red

13.

A kilovolt is a

(a) millionth of a Volt (b) thousandth of a Volt (c) thousand Volts (d) million Volts

a)

(a) millionth of a Volt

b)

(b) thousandth of a Volt

c)

(c) thousand Volts

d)

(d) million Volts

14.

The frequency of an AC waveform, whose positive peaks occur every millisecond, is

a)

(a) 1Hz

b)

(b) 1kHz

c)

(c) 1MHz

d)

(d) 1GHz

15.

If the bulb in a torch with a 1.5V alkaline battery draws 0.3A when lit, the bulb’s resistance is

a)

(a) 0.2 Ohms

b)

(b) 0.45 Ohms

c)

(c) 1.8 Ohms

d)

(d) 5 Ohms

Tech Basics

Total questions: 15

Worksheet time: 10mins

Similar Resources on Wayground