Module 3 - Electricity Basics

 

1.   Electrical current is the rate of flow of  

A   

 electrons
B  protons
C  charge
D  volts

 

2.   Current =   

A   

 charge / time
B  potential difference / time
C  potential difference x Resistance
D  charge x time

 

3.   Potential difference = 

A   

 work done / time
B  work done / charge
C  work done / volt
D  work done / resistance

4.  A charge of 1.0 coulomb flows for 2 minutes, what is the current? Ampere

5.  A current of 100mA is flowing for 10 minutes, what is the charge passedCoulombs

6.  A current of 10mA passes a charge of 100 Coulombs.  How long is the supply switched on for? seconds

 

7.   Resistance  = 

A   

 Potential difference x current
B  current / potential difference
C  Potential difference / current
D  work done / current

8.  Consider this circuit


For the resistor network shown, calculate
a)      the total resistance of the combination    ohms

      b)      the p.d. across each resistor:               

      4ohm: V,  10 ohm: V,  20 ohm: V

c)      the current through each resistor.           

      4ohm: A,  10 ohm: A,  20 ohm: A

9.   For the circuit shown, calculate  
  a)    the total resistance of the circuit ohms
  b)      I  A
  c)      I1 A
  d)      I2 A
  e)      V1 V
  f)      V2 V

 

 




10 For the circuit shown, calculate;

a)         the total resistance  kilo-ohms
b)         the total current (I)  A
c)         the branch currents (I1 and I2­) A and A
d)         the p.d. across resistor B  V
e)         the p.d. across resistor D.  V

 




 

 

11.   Energy   =  

A   

 Potential difference x current x time
B  Potential difference x time / current
C  Potential difference / current 
D  Potential difference x current

 

12.   Power   = 

A   

 Potential difference x current x time
B  Potential difference x time / current
C  Potential difference / current 
D  Potential difference x current

 

13.   Power   = 

A   

 resistance x  current squared
B  Potential difference x time squared
C  Potential difference / resistance squared 
D  current x resistance squared 

 

14. 

In the circuit shown, a d.c. supply of p.d. V and negligible internal resistance is connected to 400 W and 1600 W resistors arranged in series. 
A voltmeter of resistance 2000 W connected across the 400 W resistor gives a reading of 8.0 V.

Calculate:

    a)  the magnitude of the supply, 
 V    

   b) and hence the p.d. across the 1600 W resistor      
  V  
    c) the p.d. across the 1600 W resistor when the voltmeter is disconnected.
     V   

 

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